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Finding the Fourth Proportional to 123.17, 169.91 and 78.83

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Solution

The fourth proportional to 123.17, 169.91 and 78.83 is: 108.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.17 : 169.91 = 78.83 : x
  2. Step 2: Convert to fraction form
    123.17/169.91 = 78.83/x
  3. Step 3: Cross multiply
    123.17x = 169.91 × 78.83
  4. Step 4: Simplify right side
    123.17x = 13,394.01
  5. Step 5: Solve for x
    x = 13,394.01/123.17
  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.