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Finding the Fourth Proportional to 124.43, 170.49 and 121.79

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Solution

The fourth proportional to 124.43, 170.49 and 121.79 is: 166.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.43 : 170.49 = 121.79 : x
  2. Step 2: Convert to fraction form
    124.43/170.49 = 121.79/x
  3. Step 3: Cross multiply
    124.43x = 170.49 × 121.79
  4. Step 4: Simplify right side
    124.43x = 20,763.12
  5. Step 5: Solve for x
    x = 20,763.12/124.43
  6. Step 6: Final answer
    x = 166.87

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.