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Finding the Fourth Proportional to 123.19, 169.79 and 113.38

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Solution

The fourth proportional to 123.19, 169.79 and 113.38 is: 156.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.19 : 169.79 = 113.38 : x
  2. Step 2: Convert to fraction form
    123.19/169.79 = 113.38/x
  3. Step 3: Cross multiply
    123.19x = 169.79 × 113.38
  4. Step 4: Simplify right side
    123.19x = 19,249.80
  5. Step 5: Solve for x
    x = 19,249.80/123.19
  6. Step 6: Final answer
    x = 156.26

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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.