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Finding the Fourth Proportional to 115.20, 158.88 and 97.92

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Solution

The fourth proportional to 115.20, 158.88 and 97.92 is: 135.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.20 : 158.88 = 97.92 : x
  2. Step 2: Convert to fraction form
    115.20/158.88 = 97.92/x
  3. Step 3: Cross multiply
    115.20x = 158.88 × 97.92
  4. Step 4: Simplify right side
    115.20x = 15,557.53
  5. Step 5: Solve for x
    x = 15,557.53/115.20
  6. Step 6: Final answer
    x = 135.05

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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.