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Finding the Fourth Proportional to 330.56, 495.78 and 111.20

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Solution

The fourth proportional to 330.56, 495.78 and 111.20 is: 166.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.56 : 495.78 = 111.20 : x
  2. Step 2: Convert to fraction form
    330.56/495.78 = 111.20/x
  3. Step 3: Cross multiply
    330.56x = 495.78 × 111.20
  4. Step 4: Simplify right side
    330.56x = 55,130.74
  5. Step 5: Solve for x
    x = 55,130.74/330.56
  6. Step 6: Final answer
    x = 166.78

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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.