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Finding the Fourth Proportional to 158.28, 237.64 and 81.31

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Solution

The fourth proportional to 158.28, 237.64 and 81.31 is: 122.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.28 : 237.64 = 81.31 : x
  2. Step 2: Convert to fraction form
    158.28/237.64 = 81.31/x
  3. Step 3: Cross multiply
    158.28x = 237.64 × 81.31
  4. Step 4: Simplify right side
    158.28x = 19,321.71
  5. Step 5: Solve for x
    x = 19,321.71/158.28
  6. Step 6: Final answer
    x = 122.07

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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.