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Finding the Fourth Proportional to 158.31, 237.09 and 76.89

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Solution

The fourth proportional to 158.31, 237.09 and 76.89 is: 115.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.31 : 237.09 = 76.89 : x
  2. Step 2: Convert to fraction form
    158.31/237.09 = 76.89/x
  3. Step 3: Cross multiply
    158.31x = 237.09 × 76.89
  4. Step 4: Simplify right side
    158.31x = 18,229.85
  5. Step 5: Solve for x
    x = 18,229.85/158.31
  6. Step 6: Final answer
    x = 115.15

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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.