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Finding the Fourth Proportional to 330.08, 495.15 and 86.61

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Solution

The fourth proportional to 330.08, 495.15 and 86.61 is: 129.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.08 : 495.15 = 86.61 : x
  2. Step 2: Convert to fraction form
    330.08/495.15 = 86.61/x
  3. Step 3: Cross multiply
    330.08x = 495.15 × 86.61
  4. Step 4: Simplify right side
    330.08x = 42,882.47
  5. Step 5: Solve for x
    x = 42,882.47/330.08
  6. Step 6: Final answer
    x = 129.92

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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.