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Finding the Fourth Proportional to 261,686.97, 392,530.46 and 72,148.79

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Solution

The fourth proportional to 261,686.97, 392,530.46 and 72,148.79 is: 108,223.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,686.97 : 392,530.46 = 72,148.79 : x
  2. Step 2: Convert to fraction form
    261,686.97/392,530.46 = 72,148.79/x
  3. Step 3: Cross multiply
    261,686.97x = 392,530.46 × 72,148.79
  4. Step 4: Simplify right side
    261,686.97x = 28,320,598,347.73
  5. Step 5: Solve for x
    x = 28,320,598,347.73/261,686.97
  6. Step 6: Final answer
    x = 108,223.19

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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.