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Finding the Fourth Proportional to 261,812.89, 392,711.48 and 72,284.83

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Solution

The fourth proportional to 261,812.89, 392,711.48 and 72,284.83 is: 108,425.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,812.89 : 392,711.48 = 72,284.83 : x
  2. Step 2: Convert to fraction form
    261,812.89/392,711.48 = 72,284.83/x
  3. Step 3: Cross multiply
    261,812.89x = 392,711.48 × 72,284.83
  4. Step 4: Simplify right side
    261,812.89x = 28,387,082,570.85
  5. Step 5: Solve for x
    x = 28,387,082,570.85/261,812.89
  6. Step 6: Final answer
    x = 108,425.08

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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.