Home / 20,986.38-28,944-15,314.76

Finding the Fourth Proportional to 20,986.38, 28,944 and 15,314.76

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Solution

The fourth proportional to 20,986.38, 28,944 and 15,314.76 is: 21,121.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.38 : 28,944 = 15,314.76 : x
  2. Step 2: Convert to fraction form
    20,986.38/28,944 = 15,314.76/x
  3. Step 3: Cross multiply
    20,986.38x = 28,944 × 15,314.76
  4. Step 4: Simplify right side
    20,986.38x = 443,270,413.44
  5. Step 5: Solve for x
    x = 443,270,413.44/20,986.38
  6. Step 6: Final answer
    x = 21,121.81

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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.