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Finding the Fourth Proportional to 259,805.13, 389,663.78 and 72,773.61

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Solution

The fourth proportional to 259,805.13, 389,663.78 and 72,773.61 is: 109,148.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,805.13 : 389,663.78 = 72,773.61 : x
  2. Step 2: Convert to fraction form
    259,805.13/389,663.78 = 72,773.61/x
  3. Step 3: Cross multiply
    259,805.13x = 389,663.78 × 72,773.61
  4. Step 4: Simplify right side
    259,805.13x = 28,357,239,592.98
  5. Step 5: Solve for x
    x = 28,357,239,592.98/259,805.13
  6. Step 6: Final answer
    x = 109,148.11

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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.