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Finding the Fourth Proportional to 124.15, 171.31 and 71.68

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Solution

The fourth proportional to 124.15, 171.31 and 71.68 is: 98.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.15 : 171.31 = 71.68 : x
  2. Step 2: Convert to fraction form
    124.15/171.31 = 71.68/x
  3. Step 3: Cross multiply
    124.15x = 171.31 × 71.68
  4. Step 4: Simplify right side
    124.15x = 12,279.50
  5. Step 5: Solve for x
    x = 12,279.50/124.15
  6. Step 6: Final answer
    x = 98.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.