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Finding the Fourth Proportional to 138,659.56, 207,989.34 and 45,165.30

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Solution

The fourth proportional to 138,659.56, 207,989.34 and 45,165.30 is: 67,747.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,659.56 : 207,989.34 = 45,165.30 : x
  2. Step 2: Convert to fraction form
    138,659.56/207,989.34 = 45,165.30/x
  3. Step 3: Cross multiply
    138,659.56x = 207,989.34 × 45,165.30
  4. Step 4: Simplify right side
    138,659.56x = 9,393,900,937.90
  5. Step 5: Solve for x
    x = 9,393,900,937.90/138,659.56
  6. Step 6: Final answer
    x = 67,747.95

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Similar ratio
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1.5x scale

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.