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Finding the Fourth Proportional to 123.98, 170.99 and 92.70

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Solution

The fourth proportional to 123.98, 170.99 and 92.70 is: 127.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.98 : 170.99 = 92.70 : x
  2. Step 2: Convert to fraction form
    123.98/170.99 = 92.70/x
  3. Step 3: Cross multiply
    123.98x = 170.99 × 92.70
  4. Step 4: Simplify right side
    123.98x = 15,850.31
  5. Step 5: Solve for x
    x = 15,850.31/123.98
  6. Step 6: Final answer
    x = 127.85

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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.