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Finding the Third Proportional to 688.13 and 1,642.13

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Solution

The third proportional to 688.13 and 1,642.13 is: 3,918.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.13 : 1,642.13 = 1,642.13 : x
  2. Step 2: Convert to fraction form
    688.13/1,642.13 = 1,642.13/x
  3. Step 3: Cross multiply
    688.13x = 1,642.13 × 1,642.13
  4. Step 4: Simplify right side
    688.13x = 2,696,574.52
  5. Step 5: Solve for x
    x = 2,696,574.52/688.13
  6. Step 6: Final answer
    x = 3,918.73

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Why These Related Problems?

These problems maintain the same ratio (2.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.