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Finding the Third Proportional to 640.55 and 958.92

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Solution

The third proportional to 640.55 and 958.92 is: 1,435.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.55 : 958.92 = 958.92 : x
  2. Step 2: Convert to fraction form
    640.55/958.92 = 958.92/x
  3. Step 3: Cross multiply
    640.55x = 958.92 × 958.92
  4. Step 4: Simplify right side
    640.55x = 919,531.16
  5. Step 5: Solve for x
    x = 919,531.16/640.55
  6. Step 6: Final answer
    x = 1,435.54

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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.