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Finding the Fourth Proportional to 1,138.78, 1,711.38 and 676.64

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Solution

The fourth proportional to 1,138.78, 1,711.38 and 676.64 is: 1,016.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.78 : 1,711.38 = 676.64 : x
  2. Step 2: Convert to fraction form
    1,138.78/1,711.38 = 676.64/x
  3. Step 3: Cross multiply
    1,138.78x = 1,711.38 × 676.64
  4. Step 4: Simplify right side
    1,138.78x = 1,157,988.16
  5. Step 5: Solve for x
    x = 1,157,988.16/1,138.78
  6. Step 6: Final answer
    x = 1,016.87

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Why These Related Problems?

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