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Finding the Fourth Proportional to 478.27, 659.92 and 330.85

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Solution

The fourth proportional to 478.27, 659.92 and 330.85 is: 456.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.27 : 659.92 = 330.85 : x
  2. Step 2: Convert to fraction form
    478.27/659.92 = 330.85/x
  3. Step 3: Cross multiply
    478.27x = 659.92 × 330.85
  4. Step 4: Simplify right side
    478.27x = 218,334.53
  5. Step 5: Solve for x
    x = 218,334.53/478.27
  6. Step 6: Final answer
    x = 456.51

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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.