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Finding the Third Proportional to 21,176 and 38,680

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Solution

The third proportional to 21,176 and 38,680 is: 70,652.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,176 : 38,680 = 38,680 : x
  2. Step 2: Convert to fraction form
    21,176/38,680 = 38,680/x
  3. Step 3: Cross multiply
    21,176x = 38,680 × 38,680
  4. Step 4: Simplify right side
    21,176x = 1,496,142,400
  5. Step 5: Solve for x
    x = 1,496,142,400/21,176
  6. Step 6: Final answer
    x = 70,652.74

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Why These Related Problems?

These problems maintain the same ratio (1.83) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.