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Finding the Fourth Proportional to 124.39, 172.85 and 123.15

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Solution

The fourth proportional to 124.39, 172.85 and 123.15 is: 171.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.39 : 172.85 = 123.15 : x
  2. Step 2: Convert to fraction form
    124.39/172.85 = 123.15/x
  3. Step 3: Cross multiply
    124.39x = 172.85 × 123.15
  4. Step 4: Simplify right side
    124.39x = 21,286.48
  5. Step 5: Solve for x
    x = 21,286.48/124.39
  6. Step 6: Final answer
    x = 171.13

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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.