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Finding the Third Proportional to 811.75 and 1,247.88

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Solution

The third proportional to 811.75 and 1,247.88 is: 1,918.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.75 : 1,247.88 = 1,247.88 : x
  2. Step 2: Convert to fraction form
    811.75/1,247.88 = 1,247.88/x
  3. Step 3: Cross multiply
    811.75x = 1,247.88 × 1,247.88
  4. Step 4: Simplify right side
    811.75x = 1,557,192.02
  5. Step 5: Solve for x
    x = 1,557,192.02/811.75
  6. Step 6: Final answer
    x = 1,918.31

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.