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Finding the Fourth Proportional to 664.79, 997.19 and 318.47

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Solution

The fourth proportional to 664.79, 997.19 and 318.47 is: 477.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.79 : 997.19 = 318.47 : x
  2. Step 2: Convert to fraction form
    664.79/997.19 = 318.47/x
  3. Step 3: Cross multiply
    664.79x = 997.19 × 318.47
  4. Step 4: Simplify right side
    664.79x = 317,568.52
  5. Step 5: Solve for x
    x = 317,568.52/664.79
  6. Step 6: Final answer
    x = 477.70

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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.