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Finding the Fourth Proportional to 124.24, 171.46 and 71.79

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Solution

The fourth proportional to 124.24, 171.46 and 71.79 is: 99.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.24 : 171.46 = 71.79 : x
  2. Step 2: Convert to fraction form
    124.24/171.46 = 71.79/x
  3. Step 3: Cross multiply
    124.24x = 171.46 × 71.79
  4. Step 4: Simplify right side
    124.24x = 12,309.11
  5. Step 5: Solve for x
    x = 12,309.11/124.24
  6. Step 6: Final answer
    x = 99.08

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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.