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Finding the Fourth Proportional to 664.70, 997.20 and 318.02

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Solution

The fourth proportional to 664.70, 997.20 and 318.02 is: 477.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.70 : 997.20 = 318.02 : x
  2. Step 2: Convert to fraction form
    664.70/997.20 = 318.02/x
  3. Step 3: Cross multiply
    664.70x = 997.20 × 318.02
  4. Step 4: Simplify right side
    664.70x = 317,129.54
  5. Step 5: Solve for x
    x = 317,129.54/664.70
  6. Step 6: Final answer
    x = 477.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.