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Finding the Fourth Proportional to 124.62, 172.68 and 121.79

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Solution

The fourth proportional to 124.62, 172.68 and 121.79 is: 168.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.62 : 172.68 = 121.79 : x
  2. Step 2: Convert to fraction form
    124.62/172.68 = 121.79/x
  3. Step 3: Cross multiply
    124.62x = 172.68 × 121.79
  4. Step 4: Simplify right side
    124.62x = 21,029.83
  5. Step 5: Solve for x
    x = 21,029.83/124.62
  6. Step 6: Final answer
    x = 168.75

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.