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Finding the Fourth Proportional to 644.32, 965.22 and 318.70

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Solution

The fourth proportional to 644.32, 965.22 and 318.70 is: 477.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.32 : 965.22 = 318.70 : x
  2. Step 2: Convert to fraction form
    644.32/965.22 = 318.70/x
  3. Step 3: Cross multiply
    644.32x = 965.22 × 318.70
  4. Step 4: Simplify right side
    644.32x = 307,615.61
  5. Step 5: Solve for x
    x = 307,615.61/644.32
  6. Step 6: Final answer
    x = 477.43

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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.