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Finding the Fourth Proportional to 330.22, 495.40 and 113.78

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Solution

The fourth proportional to 330.22, 495.40 and 113.78 is: 170.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.22 : 495.40 = 113.78 : x
  2. Step 2: Convert to fraction form
    330.22/495.40 = 113.78/x
  3. Step 3: Cross multiply
    330.22x = 495.40 × 113.78
  4. Step 4: Simplify right side
    330.22x = 56,366.61
  5. Step 5: Solve for x
    x = 56,366.61/330.22
  6. Step 6: Final answer
    x = 170.69

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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.