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Finding the Fourth Proportional to 123.53, 170.50 and 86.69

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Solution

The fourth proportional to 123.53, 170.50 and 86.69 is: 119.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.53 : 170.50 = 86.69 : x
  2. Step 2: Convert to fraction form
    123.53/170.50 = 86.69/x
  3. Step 3: Cross multiply
    123.53x = 170.50 × 86.69
  4. Step 4: Simplify right side
    123.53x = 14,781.29
  5. Step 5: Solve for x
    x = 14,781.29/123.53
  6. Step 6: Final answer
    x = 119.66

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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.