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Finding the Third Proportional to 2,428 and 3,172

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Solution

The third proportional to 2,428 and 3,172 is: 4,143.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,428 : 3,172 = 3,172 : x
  2. Step 2: Convert to fraction form
    2,428/3,172 = 3,172/x
  3. Step 3: Cross multiply
    2,428x = 3,172 × 3,172
  4. Step 4: Simplify right side
    2,428x = 10,061,584
  5. Step 5: Solve for x
    x = 10,061,584/2,428
  6. Step 6: Final answer
    x = 4,143.98

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.