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Finding the Fourth Proportional to 138,587.46, 207,959.16 and 75,412.20

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Solution

The fourth proportional to 138,587.46, 207,959.16 and 75,412.20 is: 113,160.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,587.46 : 207,959.16 = 75,412.20 : x
  2. Step 2: Convert to fraction form
    138,587.46/207,959.16 = 75,412.20/x
  3. Step 3: Cross multiply
    138,587.46x = 207,959.16 × 75,412.20
  4. Step 4: Simplify right side
    138,587.46x = 15,682,657,765.75
  5. Step 5: Solve for x
    x = 15,682,657,765.75/138,587.46
  6. Step 6: Final answer
    x = 113,160.73

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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.