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Finding the Third Proportional to 978 and 2,143

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Solution

The third proportional to 978 and 2,143 is: 4,695.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    978 : 2,143 = 2,143 : x
  2. Step 2: Convert to fraction form
    978/2,143 = 2,143/x
  3. Step 3: Cross multiply
    978x = 2,143 × 2,143
  4. Step 4: Simplify right side
    978x = 4,592,449
  5. Step 5: Solve for x
    x = 4,592,449/978
  6. Step 6: Final answer
    x = 4,695.76

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.