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Finding the Fourth Proportional to 124.39, 172.40 and 122.08

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Solution

The fourth proportional to 124.39, 172.40 and 122.08 is: 169.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.39 : 172.40 = 122.08 : x
  2. Step 2: Convert to fraction form
    124.39/172.40 = 122.08/x
  3. Step 3: Cross multiply
    124.39x = 172.40 × 122.08
  4. Step 4: Simplify right side
    124.39x = 21,046.59
  5. Step 5: Solve for x
    x = 21,046.59/124.39
  6. Step 6: Final answer
    x = 169.20

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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.