Home / 30,987.81-42,763.32-16,840.71

Finding the Fourth Proportional to 30,987.81, 42,763.32 and 16,840.71

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Solution

The fourth proportional to 30,987.81, 42,763.32 and 16,840.71 is: 23,240.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,987.81 : 42,763.32 = 16,840.71 : x
  2. Step 2: Convert to fraction form
    30,987.81/42,763.32 = 16,840.71/x
  3. Step 3: Cross multiply
    30,987.81x = 42,763.32 × 16,840.71
  4. Step 4: Simplify right side
    30,987.81x = 720,164,670.76
  5. Step 5: Solve for x
    x = 720,164,670.76/30,987.81
  6. Step 6: Final answer
    x = 23,240.26

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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.