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Finding the Fourth Proportional to 330.12, 494.87 and 147.65

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Solution

The fourth proportional to 330.12, 494.87 and 147.65 is: 221.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.12 : 494.87 = 147.65 : x
  2. Step 2: Convert to fraction form
    330.12/494.87 = 147.65/x
  3. Step 3: Cross multiply
    330.12x = 494.87 × 147.65
  4. Step 4: Simplify right side
    330.12x = 73,064.34
  5. Step 5: Solve for x
    x = 73,064.34/330.12
  6. Step 6: Final answer
    x = 221.33

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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.