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Finding the Third Proportional to 640.13 and 905.91

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Solution

The third proportional to 640.13 and 905.91 is: 1,282.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.13 : 905.91 = 905.91 : x
  2. Step 2: Convert to fraction form
    640.13/905.91 = 905.91/x
  3. Step 3: Cross multiply
    640.13x = 905.91 × 905.91
  4. Step 4: Simplify right side
    640.13x = 820,666.13
  5. Step 5: Solve for x
    x = 820,666.13/640.13
  6. Step 6: Final answer
    x = 1,282.04

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.