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Finding the Third Proportional to 1,278 and 2,142

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Solution

The third proportional to 1,278 and 2,142 is: 3,590.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278 : 2,142 = 2,142 : x
  2. Step 2: Convert to fraction form
    1,278/2,142 = 2,142/x
  3. Step 3: Cross multiply
    1,278x = 2,142 × 2,142
  4. Step 4: Simplify right side
    1,278x = 4,588,164
  5. Step 5: Solve for x
    x = 4,588,164/1,278
  6. Step 6: Final answer
    x = 3,590.11

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Why These Related Problems?

These problems maintain the same ratio (1.68) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.