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Finding the Fourth Proportional to 124.72, 171.97 and 89.69

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Solution

The fourth proportional to 124.72, 171.97 and 89.69 is: 123.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.72 : 171.97 = 89.69 : x
  2. Step 2: Convert to fraction form
    124.72/171.97 = 89.69/x
  3. Step 3: Cross multiply
    124.72x = 171.97 × 89.69
  4. Step 4: Simplify right side
    124.72x = 15,422.91
  5. Step 5: Solve for x
    x = 15,422.91/124.72
  6. Step 6: Final answer
    x = 123.66

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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.