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Finding the Fourth Proportional to 71,640.35, 98,861.70 and 39,808.43

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Solution

The fourth proportional to 71,640.35, 98,861.70 and 39,808.43 is: 54,934.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,640.35 : 98,861.70 = 39,808.43 : x
  2. Step 2: Convert to fraction form
    71,640.35/98,861.70 = 39,808.43/x
  3. Step 3: Cross multiply
    71,640.35x = 98,861.70 × 39,808.43
  4. Step 4: Simplify right side
    71,640.35x = 3,935,529,064.13
  5. Step 5: Solve for x
    x = 3,935,529,064.13/71,640.35
  6. Step 6: Final answer
    x = 54,934.53

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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.