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Finding the Fourth Proportional to 158.38, 237.71 and 81.39

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Solution

The fourth proportional to 158.38, 237.71 and 81.39 is: 122.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.38 : 237.71 = 81.39 : x
  2. Step 2: Convert to fraction form
    158.38/237.71 = 81.39/x
  3. Step 3: Cross multiply
    158.38x = 237.71 × 81.39
  4. Step 4: Simplify right side
    158.38x = 19,346.81
  5. Step 5: Solve for x
    x = 19,346.81/158.38
  6. Step 6: Final answer
    x = 122.16

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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.