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Finding the Fourth Proportional to 123.60, 170.50 and 76.96

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Solution

The fourth proportional to 123.60, 170.50 and 76.96 is: 106.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.60 : 170.50 = 76.96 : x
  2. Step 2: Convert to fraction form
    123.60/170.50 = 76.96/x
  3. Step 3: Cross multiply
    123.60x = 170.50 × 76.96
  4. Step 4: Simplify right side
    123.60x = 13,121.68
  5. Step 5: Solve for x
    x = 13,121.68/123.60
  6. Step 6: Final answer
    x = 106.16

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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.