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Finding the Third Proportional to 478 and 1,187

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Solution

The third proportional to 478 and 1,187 is: 2,947.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    478 : 1,187 = 1,187 : x
  2. Step 2: Convert to fraction form
    478/1,187 = 1,187/x
  3. Step 3: Cross multiply
    478x = 1,187 × 1,187
  4. Step 4: Simplify right side
    478x = 1,408,969
  5. Step 5: Solve for x
    x = 1,408,969/478
  6. Step 6: Final answer
    x = 2,947.63

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Why These Related Problems?

These problems maintain the same ratio (2.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.