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Finding the Fourth Proportional to 124.24, 171.44 and 71.78

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Solution

The fourth proportional to 124.24, 171.44 and 71.78 is: 99.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.24 : 171.44 = 71.78 : x
  2. Step 2: Convert to fraction form
    124.24/171.44 = 71.78/x
  3. Step 3: Cross multiply
    124.24x = 171.44 × 71.78
  4. Step 4: Simplify right side
    124.24x = 12,305.60
  5. Step 5: Solve for x
    x = 12,305.60/124.24
  6. Step 6: Final answer
    x = 99.05

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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.