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Finding the Fourth Proportional to 655.48, 981.26 and 639.75

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Solution

The fourth proportional to 655.48, 981.26 and 639.75 is: 957.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.48 : 981.26 = 639.75 : x
  2. Step 2: Convert to fraction form
    655.48/981.26 = 639.75/x
  3. Step 3: Cross multiply
    655.48x = 981.26 × 639.75
  4. Step 4: Simplify right side
    655.48x = 627,761.09
  5. Step 5: Solve for x
    x = 627,761.09/655.48
  6. Step 6: Final answer
    x = 957.71

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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.