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Finding the Third Proportional to 827 and 1,281.50

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Solution

The third proportional to 827 and 1,281.50 is: 1,985.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    827 : 1,281.50 = 1,281.50 : x
  2. Step 2: Convert to fraction form
    827/1,281.50 = 1,281.50/x
  3. Step 3: Cross multiply
    827x = 1,281.50 × 1,281.50
  4. Step 4: Simplify right side
    827x = 1,642,242.25
  5. Step 5: Solve for x
    x = 1,642,242.25/827
  6. Step 6: Final answer
    x = 1,985.78

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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.