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Finding the Third Proportional to 21,555 and 28,971

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Solution

The third proportional to 21,555 and 28,971 is: 38,938.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,555 : 28,971 = 28,971 : x
  2. Step 2: Convert to fraction form
    21,555/28,971 = 28,971/x
  3. Step 3: Cross multiply
    21,555x = 28,971 × 28,971
  4. Step 4: Simplify right side
    21,555x = 839,318,841
  5. Step 5: Solve for x
    x = 839,318,841/21,555
  6. Step 6: Final answer
    x = 38,938.48

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.