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Finding the Fourth Proportional to 85,680.56, 128,488.92 and 29,505.04

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Solution

The fourth proportional to 85,680.56, 128,488.92 and 29,505.04 is: 44,246.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,680.56 : 128,488.92 = 29,505.04 : x
  2. Step 2: Convert to fraction form
    85,680.56/128,488.92 = 29,505.04/x
  3. Step 3: Cross multiply
    85,680.56x = 128,488.92 × 29,505.04
  4. Step 4: Simplify right side
    85,680.56x = 3,791,070,724.16
  5. Step 5: Solve for x
    x = 3,791,070,724.16/85,680.56
  6. Step 6: Final answer
    x = 44,246.57

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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.