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Finding the Fourth Proportional to 124.85, 187.31 and 42.58

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Solution

The fourth proportional to 124.85, 187.31 and 42.58 is: 63.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.85 : 187.31 = 42.58 : x
  2. Step 2: Convert to fraction form
    124.85/187.31 = 42.58/x
  3. Step 3: Cross multiply
    124.85x = 187.31 × 42.58
  4. Step 4: Simplify right side
    124.85x = 7,974.98
  5. Step 5: Solve for x
    x = 7,974.98/124.85
  6. Step 6: Final answer
    x = 63.88

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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.