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Finding the Fourth Proportional to 138,660.56, 207,990.84 and 45,166.30

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Solution

The fourth proportional to 138,660.56, 207,990.84 and 45,166.30 is: 67,749.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,660.56 : 207,990.84 = 45,166.30 : x
  2. Step 2: Convert to fraction form
    138,660.56/207,990.84 = 45,166.30/x
  3. Step 3: Cross multiply
    138,660.56x = 207,990.84 × 45,166.30
  4. Step 4: Simplify right side
    138,660.56x = 9,394,176,676.69
  5. Step 5: Solve for x
    x = 9,394,176,676.69/138,660.56
  6. Step 6: Final answer
    x = 67,749.45

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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.