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Finding the Fourth Proportional to 81,440.64, 112,385.88 and 45,632.88

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Solution

The fourth proportional to 81,440.64, 112,385.88 and 45,632.88 is: 62,972.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,440.64 : 112,385.88 = 45,632.88 : x
  2. Step 2: Convert to fraction form
    81,440.64/112,385.88 = 45,632.88/x
  3. Step 3: Cross multiply
    81,440.64x = 112,385.88 × 45,632.88
  4. Step 4: Simplify right side
    81,440.64x = 5,128,491,375.73
  5. Step 5: Solve for x
    x = 5,128,491,375.73/81,440.64
  6. Step 6: Final answer
    x = 62,972.14

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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.