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Finding the Third Proportional to 640.13 and 991.13

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Solution

The third proportional to 640.13 and 991.13 is: 1,534.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.13 : 991.13 = 991.13 : x
  2. Step 2: Convert to fraction form
    640.13/991.13 = 991.13/x
  3. Step 3: Cross multiply
    640.13x = 991.13 × 991.13
  4. Step 4: Simplify right side
    640.13x = 982,328.77
  5. Step 5: Solve for x
    x = 982,328.77/640.13
  6. Step 6: Final answer
    x = 1,534.59

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.