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Finding the Fourth Proportional to 71,742.92, 99,005.10 and 39,912.08

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Solution

The fourth proportional to 71,742.92, 99,005.10 and 39,912.08 is: 55,078.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,742.92 : 99,005.10 = 39,912.08 : x
  2. Step 2: Convert to fraction form
    71,742.92/99,005.10 = 39,912.08/x
  3. Step 3: Cross multiply
    71,742.92x = 99,005.10 × 39,912.08
  4. Step 4: Simplify right side
    71,742.92x = 3,951,499,471.61
  5. Step 5: Solve for x
    x = 3,951,499,471.61/71,742.92
  6. Step 6: Final answer
    x = 55,078.60

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1.5x scale

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.