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Finding the Fourth Proportional to 124.20, 172.17 and 121.95

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Solution

The fourth proportional to 124.20, 172.17 and 121.95 is: 169.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.20 : 172.17 = 121.95 : x
  2. Step 2: Convert to fraction form
    124.20/172.17 = 121.95/x
  3. Step 3: Cross multiply
    124.20x = 172.17 × 121.95
  4. Step 4: Simplify right side
    124.20x = 20,996.13
  5. Step 5: Solve for x
    x = 20,996.13/124.20
  6. Step 6: Final answer
    x = 169.05

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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.