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Finding the Fourth Proportional to 478.56, 660.20 and 331.54

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Solution

The fourth proportional to 478.56, 660.20 and 331.54 is: 457.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.56 : 660.20 = 331.54 : x
  2. Step 2: Convert to fraction form
    478.56/660.20 = 331.54/x
  3. Step 3: Cross multiply
    478.56x = 660.20 × 331.54
  4. Step 4: Simplify right side
    478.56x = 218,882.71
  5. Step 5: Solve for x
    x = 218,882.71/478.56
  6. Step 6: Final answer
    x = 457.38

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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.