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Finding the Fourth Proportional to 123.03, 169.79 and 78.77

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Solution

The fourth proportional to 123.03, 169.79 and 78.77 is: 108.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.03 : 169.79 = 78.77 : x
  2. Step 2: Convert to fraction form
    123.03/169.79 = 78.77/x
  3. Step 3: Cross multiply
    123.03x = 169.79 × 78.77
  4. Step 4: Simplify right side
    123.03x = 13,373.12
  5. Step 5: Solve for x
    x = 13,373.12/123.03
  6. Step 6: Final answer
    x = 108.70

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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.