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Finding the Fourth Proportional to 71,491.40, 98,654.76 and 39,659.60

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Solution

The fourth proportional to 71,491.40, 98,654.76 and 39,659.60 is: 54,728.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,491.40 : 98,654.76 = 39,659.60 : x
  2. Step 2: Convert to fraction form
    71,491.40/98,654.76 = 39,659.60/x
  3. Step 3: Cross multiply
    71,491.40x = 98,654.76 × 39,659.60
  4. Step 4: Simplify right side
    71,491.40x = 3,912,608,319.70
  5. Step 5: Solve for x
    x = 3,912,608,319.70/71,491.40
  6. Step 6: Final answer
    x = 54,728.38

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Similar ratio
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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.