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Finding the Third Proportional to 781.50 and 1,725

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Solution

The third proportional to 781.50 and 1,725 is: 3,807.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.50 : 1,725 = 1,725 : x
  2. Step 2: Convert to fraction form
    781.50/1,725 = 1,725/x
  3. Step 3: Cross multiply
    781.50x = 1,725 × 1,725
  4. Step 4: Simplify right side
    781.50x = 2,975,625
  5. Step 5: Solve for x
    x = 2,975,625/781.50
  6. Step 6: Final answer
    x = 3,807.58

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.