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Finding the Fourth Proportional to 158.31, 237.62 and 86.22

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Solution

The fourth proportional to 158.31, 237.62 and 86.22 is: 129.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.31 : 237.62 = 86.22 : x
  2. Step 2: Convert to fraction form
    158.31/237.62 = 86.22/x
  3. Step 3: Cross multiply
    158.31x = 237.62 × 86.22
  4. Step 4: Simplify right side
    158.31x = 20,487.17
  5. Step 5: Solve for x
    x = 20,487.17/158.31
  6. Step 6: Final answer
    x = 129.41

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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.