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Finding the Fourth Proportional to 159.38, 219.96 and 101.28

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Solution

The fourth proportional to 159.38, 219.96 and 101.28 is: 139.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.38 : 219.96 = 101.28 : x
  2. Step 2: Convert to fraction form
    159.38/219.96 = 101.28/x
  3. Step 3: Cross multiply
    159.38x = 219.96 × 101.28
  4. Step 4: Simplify right side
    159.38x = 22,277.55
  5. Step 5: Solve for x
    x = 22,277.55/159.38
  6. Step 6: Final answer
    x = 139.78

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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.