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Finding the Fourth Proportional to 478.89, 660.15 and 331.83

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Solution

The fourth proportional to 478.89, 660.15 and 331.83 is: 457.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.89 : 660.15 = 331.83 : x
  2. Step 2: Convert to fraction form
    478.89/660.15 = 331.83/x
  3. Step 3: Cross multiply
    478.89x = 660.15 × 331.83
  4. Step 4: Simplify right side
    478.89x = 219,057.57
  5. Step 5: Solve for x
    x = 219,057.57/478.89
  6. Step 6: Final answer
    x = 457.43

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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.