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Finding the Fourth Proportional to 269, 403.49 and 86.55

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Solution

The fourth proportional to 269, 403.49 and 86.55 is: 129.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    269 : 403.49 = 86.55 : x
  2. Step 2: Convert to fraction form
    269/403.49 = 86.55/x
  3. Step 3: Cross multiply
    269x = 403.49 × 86.55
  4. Step 4: Simplify right side
    269x = 34,922.06
  5. Step 5: Solve for x
    x = 34,922.06/269
  6. Step 6: Final answer
    x = 129.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.