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Finding the Fourth Proportional to 330.10, 495.10 and 86.65

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Solution

The fourth proportional to 330.10, 495.10 and 86.65 is: 129.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.10 : 495.10 = 86.65 : x
  2. Step 2: Convert to fraction form
    330.10/495.10 = 86.65/x
  3. Step 3: Cross multiply
    330.10x = 495.10 × 86.65
  4. Step 4: Simplify right side
    330.10x = 42,900.42
  5. Step 5: Solve for x
    x = 42,900.42/330.10
  6. Step 6: Final answer
    x = 129.96

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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.