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Finding the Fourth Proportional to 644.52, 960.57 and 639.15

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Solution

The fourth proportional to 644.52, 960.57 and 639.15 is: 952.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.52 : 960.57 = 639.15 : x
  2. Step 2: Convert to fraction form
    644.52/960.57 = 639.15/x
  3. Step 3: Cross multiply
    644.52x = 960.57 × 639.15
  4. Step 4: Simplify right side
    644.52x = 613,948.32
  5. Step 5: Solve for x
    x = 613,948.32/644.52
  6. Step 6: Final answer
    x = 952.57

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.