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Finding the Fourth Proportional to 331.85, 497.78 and 149.20

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Solution

The fourth proportional to 331.85, 497.78 and 149.20 is: 223.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.85 : 497.78 = 149.20 : x
  2. Step 2: Convert to fraction form
    331.85/497.78 = 149.20/x
  3. Step 3: Cross multiply
    331.85x = 497.78 × 149.20
  4. Step 4: Simplify right side
    331.85x = 74,266.79
  5. Step 5: Solve for x
    x = 74,266.79/331.85
  6. Step 6: Final answer
    x = 223.79

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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.