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Finding the Fourth Proportional to 478.66, 660.42 and 331.36

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Solution

The fourth proportional to 478.66, 660.42 and 331.36 is: 457.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.66 : 660.42 = 331.36 : x
  2. Step 2: Convert to fraction form
    478.66/660.42 = 331.36/x
  3. Step 3: Cross multiply
    478.66x = 660.42 × 331.36
  4. Step 4: Simplify right side
    478.66x = 218,836.77
  5. Step 5: Solve for x
    x = 218,836.77/478.66
  6. Step 6: Final answer
    x = 457.19

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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.