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Finding the Fourth Proportional to 123,471.92, 170,236.40 and 100,787.88

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Solution

The fourth proportional to 123,471.92, 170,236.40 and 100,787.88 is: 138,960.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,471.92 : 170,236.40 = 100,787.88 : x
  2. Step 2: Convert to fraction form
    123,471.92/170,236.40 = 100,787.88/x
  3. Step 3: Cross multiply
    123,471.92x = 170,236.40 × 100,787.88
  4. Step 4: Simplify right side
    123,471.92x = 17,157,765,854.83
  5. Step 5: Solve for x
    x = 17,157,765,854.83/123,471.92
  6. Step 6: Final answer
    x = 138,960.87

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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.