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Finding the Third Proportional to 987.75 and 1,296

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Solution

The third proportional to 987.75 and 1,296 is: 1,700.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.75 : 1,296 = 1,296 : x
  2. Step 2: Convert to fraction form
    987.75/1,296 = 1,296/x
  3. Step 3: Cross multiply
    987.75x = 1,296 × 1,296
  4. Step 4: Simplify right side
    987.75x = 1,679,616
  5. Step 5: Solve for x
    x = 1,679,616/987.75
  6. Step 6: Final answer
    x = 1,700.45

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.