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Finding the Fourth Proportional to 123.57, 170.55 and 71.82

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Solution

The fourth proportional to 123.57, 170.55 and 71.82 is: 99.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.57 : 170.55 = 71.82 : x
  2. Step 2: Convert to fraction form
    123.57/170.55 = 71.82/x
  3. Step 3: Cross multiply
    123.57x = 170.55 × 71.82
  4. Step 4: Simplify right side
    123.57x = 12,248.90
  5. Step 5: Solve for x
    x = 12,248.90/123.57
  6. Step 6: Final answer
    x = 99.13

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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.