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Finding the Third Proportional to 987.19 and 1,318.78

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Solution

The third proportional to 987.19 and 1,318.78 is: 1,761.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.19 : 1,318.78 = 1,318.78 : x
  2. Step 2: Convert to fraction form
    987.19/1,318.78 = 1,318.78/x
  3. Step 3: Cross multiply
    987.19x = 1,318.78 × 1,318.78
  4. Step 4: Simplify right side
    987.19x = 1,739,183.99
  5. Step 5: Solve for x
    x = 1,739,183.99/987.19
  6. Step 6: Final answer
    x = 1,761.76

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.