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Finding the Fourth Proportional to 123.60, 170.48 and 71.86

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Solution

The fourth proportional to 123.60, 170.48 and 71.86 is: 99.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.60 : 170.48 = 71.86 : x
  2. Step 2: Convert to fraction form
    123.60/170.48 = 71.86/x
  3. Step 3: Cross multiply
    123.60x = 170.48 × 71.86
  4. Step 4: Simplify right side
    123.60x = 12,250.69
  5. Step 5: Solve for x
    x = 12,250.69/123.60
  6. Step 6: Final answer
    x = 99.12

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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.