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Finding the Fourth Proportional to 640.26, 952.71 and 638.10

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Solution

The fourth proportional to 640.26, 952.71 and 638.10 is: 949.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.26 : 952.71 = 638.10 : x
  2. Step 2: Convert to fraction form
    640.26/952.71 = 638.10/x
  3. Step 3: Cross multiply
    640.26x = 952.71 × 638.10
  4. Step 4: Simplify right side
    640.26x = 607,924.25
  5. Step 5: Solve for x
    x = 607,924.25/640.26
  6. Step 6: Final answer
    x = 949.50

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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.