Home / 31,397.69-43,340.18-20,790.74

Finding the Fourth Proportional to 31,397.69, 43,340.18 and 20,790.74

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Solution

The fourth proportional to 31,397.69, 43,340.18 and 20,790.74 is: 28,698.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,397.69 : 43,340.18 = 20,790.74 : x
  2. Step 2: Convert to fraction form
    31,397.69/43,340.18 = 20,790.74/x
  3. Step 3: Cross multiply
    31,397.69x = 43,340.18 × 20,790.74
  4. Step 4: Simplify right side
    31,397.69x = 901,074,413.93
  5. Step 5: Solve for x
    x = 901,074,413.93/31,397.69
  6. Step 6: Final answer
    x = 28,698.75

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Find fourth proportional to 15,698.85, 21,670.09 and 10,395.37
Half scale
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Double scale
Find fourth proportional to 31,398.69, 43,341.56 and 20,791.74
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.