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Finding the Fourth Proportional to 123.39, 170.40 and 108

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Solution

The fourth proportional to 123.39, 170.40 and 108 is: 149.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.39 : 170.40 = 108 : x
  2. Step 2: Convert to fraction form
    123.39/170.40 = 108/x
  3. Step 3: Cross multiply
    123.39x = 170.40 × 108
  4. Step 4: Simplify right side
    123.39x = 18,403.61
  5. Step 5: Solve for x
    x = 18,403.61/123.39
  6. Step 6: Final answer
    x = 149.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.