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Finding the Fourth Proportional to 123.04, 169.82 and 78.79

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Solution

The fourth proportional to 123.04, 169.82 and 78.79 is: 108.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.04 : 169.82 = 78.79 : x
  2. Step 2: Convert to fraction form
    123.04/169.82 = 78.79/x
  3. Step 3: Cross multiply
    123.04x = 169.82 × 78.79
  4. Step 4: Simplify right side
    123.04x = 13,378.87
  5. Step 5: Solve for x
    x = 13,378.87/123.04
  6. Step 6: Final answer
    x = 108.74

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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.