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Finding the Fourth Proportional to 387,695.70, 581,368.53 and 138,384.18

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Solution

The fourth proportional to 387,695.70, 581,368.53 and 138,384.18 is: 207,513.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,695.70 : 581,368.53 = 138,384.18 : x
  2. Step 2: Convert to fraction form
    387,695.70/581,368.53 = 138,384.18/x
  3. Step 3: Cross multiply
    387,695.70x = 581,368.53 × 138,384.18
  4. Step 4: Simplify right side
    387,695.70x = 80,452,207,301.86
  5. Step 5: Solve for x
    x = 80,452,207,301.86/387,695.70
  6. Step 6: Final answer
    x = 207,513.80

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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.