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Finding the Fourth Proportional to 115.31, 158.96 and 99.69

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Solution

The fourth proportional to 115.31, 158.96 and 99.69 is: 137.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.31 : 158.96 = 99.69 : x
  2. Step 2: Convert to fraction form
    115.31/158.96 = 99.69/x
  3. Step 3: Cross multiply
    115.31x = 158.96 × 99.69
  4. Step 4: Simplify right side
    115.31x = 15,846.38
  5. Step 5: Solve for x
    x = 15,846.38/115.31
  6. Step 6: Final answer
    x = 137.42

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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.