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Finding the Third Proportional to 15,628 and 21,210

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Solution

The third proportional to 15,628 and 21,210 is: 28,785.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,628 : 21,210 = 21,210 : x
  2. Step 2: Convert to fraction form
    15,628/21,210 = 21,210/x
  3. Step 3: Cross multiply
    15,628x = 21,210 × 21,210
  4. Step 4: Simplify right side
    15,628x = 449,864,100
  5. Step 5: Solve for x
    x = 449,864,100/15,628
  6. Step 6: Final answer
    x = 28,785.78

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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.