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Finding the Fourth Proportional to 123.59, 170.57 and 79.85

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Solution

The fourth proportional to 123.59, 170.57 and 79.85 is: 110.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.59 : 170.57 = 79.85 : x
  2. Step 2: Convert to fraction form
    123.59/170.57 = 79.85/x
  3. Step 3: Cross multiply
    123.59x = 170.57 × 79.85
  4. Step 4: Simplify right side
    123.59x = 13,620.01
  5. Step 5: Solve for x
    x = 13,620.01/123.59
  6. Step 6: Final answer
    x = 110.20

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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.