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Finding the Third Proportional to 878.34 and 1,318.78

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Solution

The third proportional to 878.34 and 1,318.78 is: 1,980.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.34 : 1,318.78 = 1,318.78 : x
  2. Step 2: Convert to fraction form
    878.34/1,318.78 = 1,318.78/x
  3. Step 3: Cross multiply
    878.34x = 1,318.78 × 1,318.78
  4. Step 4: Simplify right side
    878.34x = 1,739,183.99
  5. Step 5: Solve for x
    x = 1,739,183.99/878.34
  6. Step 6: Final answer
    x = 1,980.07

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.