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Finding the Fourth Proportional to 123.90, 170.82 and 82.37

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Solution

The fourth proportional to 123.90, 170.82 and 82.37 is: 113.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.90 : 170.82 = 82.37 : x
  2. Step 2: Convert to fraction form
    123.90/170.82 = 82.37/x
  3. Step 3: Cross multiply
    123.90x = 170.82 × 82.37
  4. Step 4: Simplify right side
    123.90x = 14,070.44
  5. Step 5: Solve for x
    x = 14,070.44/123.90
  6. Step 6: Final answer
    x = 113.56

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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.