Home / 138,153.05-207,221.13-81,258.42

Finding the Fourth Proportional to 138,153.05, 207,221.13 and 81,258.42

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Solution

The fourth proportional to 138,153.05, 207,221.13 and 81,258.42 is: 121,882.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,153.05 : 207,221.13 = 81,258.42 : x
  2. Step 2: Convert to fraction form
    138,153.05/207,221.13 = 81,258.42/x
  3. Step 3: Cross multiply
    138,153.05x = 207,221.13 × 81,258.42
  4. Step 4: Simplify right side
    138,153.05x = 16,838,461,614.41
  5. Step 5: Solve for x
    x = 16,838,461,614.41/138,153.05
  6. Step 6: Final answer
    x = 121,882.66

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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.