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Finding the Fourth Proportional to 387,737.28, 581,613.21 and 121,491.90

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Solution

The fourth proportional to 387,737.28, 581,613.21 and 121,491.90 is: 182,240.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,737.28 : 581,613.21 = 121,491.90 : x
  2. Step 2: Convert to fraction form
    387,737.28/581,613.21 = 121,491.90/x
  3. Step 3: Cross multiply
    387,737.28x = 581,613.21 × 121,491.90
  4. Step 4: Simplify right side
    387,737.28x = 70,661,293,948.00
  5. Step 5: Solve for x
    x = 70,661,293,948.00/387,737.28
  6. Step 6: Final answer
    x = 182,240.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.