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Finding the Fourth Proportional to 123.24, 169.80 and 101.40

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Solution

The fourth proportional to 123.24, 169.80 and 101.40 is: 139.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.24 : 169.80 = 101.40 : x
  2. Step 2: Convert to fraction form
    123.24/169.80 = 101.40/x
  3. Step 3: Cross multiply
    123.24x = 169.80 × 101.40
  4. Step 4: Simplify right side
    123.24x = 17,217.72
  5. Step 5: Solve for x
    x = 17,217.72/123.24
  6. Step 6: Final answer
    x = 139.71

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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.