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Finding the Fourth Proportional to 330.72, 456.30 and 199.65

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Solution

The fourth proportional to 330.72, 456.30 and 199.65 is: 275.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.72 : 456.30 = 199.65 : x
  2. Step 2: Convert to fraction form
    330.72/456.30 = 199.65/x
  3. Step 3: Cross multiply
    330.72x = 456.30 × 199.65
  4. Step 4: Simplify right side
    330.72x = 91,100.30
  5. Step 5: Solve for x
    x = 91,100.30/330.72
  6. Step 6: Final answer
    x = 275.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.