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Finding the Third Proportional to 781.50 and 1,178.25

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Solution

The third proportional to 781.50 and 1,178.25 is: 1,776.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.50 : 1,178.25 = 1,178.25 : x
  2. Step 2: Convert to fraction form
    781.50/1,178.25 = 1,178.25/x
  3. Step 3: Cross multiply
    781.50x = 1,178.25 × 1,178.25
  4. Step 4: Simplify right side
    781.50x = 1,388,273.06
  5. Step 5: Solve for x
    x = 1,388,273.06/781.50
  6. Step 6: Final answer
    x = 1,776.42

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.