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Finding the Third Proportional to 1,378 and 2,972

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Solution

The third proportional to 1,378 and 2,972 is: 6,409.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378 : 2,972 = 2,972 : x
  2. Step 2: Convert to fraction form
    1,378/2,972 = 2,972/x
  3. Step 3: Cross multiply
    1,378x = 2,972 × 2,972
  4. Step 4: Simplify right side
    1,378x = 8,832,784
  5. Step 5: Solve for x
    x = 8,832,784/1,378
  6. Step 6: Final answer
    x = 6,409.86

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.