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Finding the Fourth Proportional to 329.78, 494.85 and 147.30

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Solution

The fourth proportional to 329.78, 494.85 and 147.30 is: 221.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.78 : 494.85 = 147.30 : x
  2. Step 2: Convert to fraction form
    329.78/494.85 = 147.30/x
  3. Step 3: Cross multiply
    329.78x = 494.85 × 147.30
  4. Step 4: Simplify right side
    329.78x = 72,891.41
  5. Step 5: Solve for x
    x = 72,891.41/329.78
  6. Step 6: Final answer
    x = 221.03

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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.