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Finding the Third Proportional to 438 and 1,187

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Solution

The third proportional to 438 and 1,187 is: 3,216.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    438 : 1,187 = 1,187 : x
  2. Step 2: Convert to fraction form
    438/1,187 = 1,187/x
  3. Step 3: Cross multiply
    438x = 1,187 × 1,187
  4. Step 4: Simplify right side
    438x = 1,408,969
  5. Step 5: Solve for x
    x = 1,408,969/438
  6. Step 6: Final answer
    x = 3,216.82

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Why These Related Problems?

These problems maintain the same ratio (2.71) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.