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Finding the Fourth Proportional to 81,472.48, 112,279.84 and 63,539.20

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Solution

The fourth proportional to 81,472.48, 112,279.84 and 63,539.20 is: 87,565.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,472.48 : 112,279.84 = 63,539.20 : x
  2. Step 2: Convert to fraction form
    81,472.48/112,279.84 = 63,539.20/x
  3. Step 3: Cross multiply
    81,472.48x = 112,279.84 × 63,539.20
  4. Step 4: Simplify right side
    81,472.48x = 7,134,171,209.73
  5. Step 5: Solve for x
    x = 7,134,171,209.73/81,472.48
  6. Step 6: Final answer
    x = 87,565.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.