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Finding the Fourth Proportional to 159,478.68, 239,139.78 and 91,082.28

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Solution

The fourth proportional to 159,478.68, 239,139.78 and 91,082.28 is: 136,578.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,478.68 : 239,139.78 = 91,082.28 : x
  2. Step 2: Convert to fraction form
    159,478.68/239,139.78 = 91,082.28/x
  3. Step 3: Cross multiply
    159,478.68x = 239,139.78 × 91,082.28
  4. Step 4: Simplify right side
    159,478.68x = 21,781,396,401.10
  5. Step 5: Solve for x
    x = 21,781,396,401.10/159,478.68
  6. Step 6: Final answer
    x = 136,578.74

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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.