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Finding the Fourth Proportional to 639.28, 952.43 and 613.36

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Solution

The fourth proportional to 639.28, 952.43 and 613.36 is: 913.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.28 : 952.43 = 613.36 : x
  2. Step 2: Convert to fraction form
    639.28/952.43 = 613.36/x
  3. Step 3: Cross multiply
    639.28x = 952.43 × 613.36
  4. Step 4: Simplify right side
    639.28x = 584,182.46
  5. Step 5: Solve for x
    x = 584,182.46/639.28
  6. Step 6: Final answer
    x = 913.81

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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.