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Finding the Third Proportional to 865.13 and 1,312.31

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Solution

The third proportional to 865.13 and 1,312.31 is: 1,990.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.13 : 1,312.31 = 1,312.31 : x
  2. Step 2: Convert to fraction form
    865.13/1,312.31 = 1,312.31/x
  3. Step 3: Cross multiply
    865.13x = 1,312.31 × 1,312.31
  4. Step 4: Simplify right side
    865.13x = 1,722,164.10
  5. Step 5: Solve for x
    x = 1,722,164.10/865.13
  6. Step 6: Final answer
    x = 1,990.65

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.