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Finding the Third Proportional to 15,672 and 21,285

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Solution

The third proportional to 15,672 and 21,285 is: 28,908.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,672 : 21,285 = 21,285 : x
  2. Step 2: Convert to fraction form
    15,672/21,285 = 21,285/x
  3. Step 3: Cross multiply
    15,672x = 21,285 × 21,285
  4. Step 4: Simplify right side
    15,672x = 453,051,225
  5. Step 5: Solve for x
    x = 453,051,225/15,672
  6. Step 6: Final answer
    x = 28,908.32

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.