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Finding the Third Proportional to 15,760 and 21,028

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Solution

The third proportional to 15,760 and 21,028 is: 28,056.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,760 : 21,028 = 21,028 : x
  2. Step 2: Convert to fraction form
    15,760/21,028 = 21,028/x
  3. Step 3: Cross multiply
    15,760x = 21,028 × 21,028
  4. Step 4: Simplify right side
    15,760x = 442,176,784
  5. Step 5: Solve for x
    x = 442,176,784/15,760
  6. Step 6: Final answer
    x = 28,056.90

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.