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Finding the Third Proportional to 991.50 and 1,278

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Solution

The third proportional to 991.50 and 1,278 is: 1,647.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.50 : 1,278 = 1,278 : x
  2. Step 2: Convert to fraction form
    991.50/1,278 = 1,278/x
  3. Step 3: Cross multiply
    991.50x = 1,278 × 1,278
  4. Step 4: Simplify right side
    991.50x = 1,633,284
  5. Step 5: Solve for x
    x = 1,633,284/991.50
  6. Step 6: Final answer
    x = 1,647.29

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Why These Related Problems?

These problems maintain the same ratio (1.29) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.