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Finding the Fourth Proportional to 269.44, 403.90 and 86.72

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Solution

The fourth proportional to 269.44, 403.90 and 86.72 is: 129.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.44 : 403.90 = 86.72 : x
  2. Step 2: Convert to fraction form
    269.44/403.90 = 86.72/x
  3. Step 3: Cross multiply
    269.44x = 403.90 × 86.72
  4. Step 4: Simplify right side
    269.44x = 35,023.75
  5. Step 5: Solve for x
    x = 35,023.75/269.44
  6. Step 6: Final answer
    x = 129.99

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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.