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Finding the Fourth Proportional to 269.30, 403.98 and 86.72

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Solution

The fourth proportional to 269.30, 403.98 and 86.72 is: 130.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.30 : 403.98 = 86.72 : x
  2. Step 2: Convert to fraction form
    269.30/403.98 = 86.72/x
  3. Step 3: Cross multiply
    269.30x = 403.98 × 86.72
  4. Step 4: Simplify right side
    269.30x = 35,031.13
  5. Step 5: Solve for x
    x = 35,031.13/269.30
  6. Step 6: Final answer
    x = 130.08

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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.