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Finding the Fourth Proportional to 128,057.36, 176,719.24 and 71,468.72

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Solution

The fourth proportional to 128,057.36, 176,719.24 and 71,468.72 is: 98,626.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,057.36 : 176,719.24 = 71,468.72 : x
  2. Step 2: Convert to fraction form
    128,057.36/176,719.24 = 71,468.72/x
  3. Step 3: Cross multiply
    128,057.36x = 176,719.24 × 71,468.72
  4. Step 4: Simplify right side
    128,057.36x = 12,629,897,882.17
  5. Step 5: Solve for x
    x = 12,629,897,882.17/128,057.36
  6. Step 6: Final answer
    x = 98,626.88

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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.