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Finding the Fourth Proportional to 71,640.92, 98,864.90 and 39,375.20

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Solution

The fourth proportional to 71,640.92, 98,864.90 and 39,375.20 is: 54,338.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,640.92 : 98,864.90 = 39,375.20 : x
  2. Step 2: Convert to fraction form
    71,640.92/98,864.90 = 39,375.20/x
  3. Step 3: Cross multiply
    71,640.92x = 98,864.90 × 39,375.20
  4. Step 4: Simplify right side
    71,640.92x = 3,892,825,210.48
  5. Step 5: Solve for x
    x = 3,892,825,210.48/71,640.92
  6. Step 6: Final answer
    x = 54,338.01

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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.