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Finding the Fourth Proportional to 123, 169.90 and 79.48

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Solution

The fourth proportional to 123, 169.90 and 79.48 is: 109.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    123 : 169.90 = 79.48 : x
  2. Step 2: Convert to fraction form
    123/169.90 = 79.48/x
  3. Step 3: Cross multiply
    123x = 169.90 × 79.48
  4. Step 4: Simplify right side
    123x = 13,503.65
  5. Step 5: Solve for x
    x = 13,503.65/123
  6. Step 6: Final answer
    x = 109.79

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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.