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Finding the Third Proportional to 21,189 and 28,130

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Solution

The third proportional to 21,189 and 28,130 is: 37,344.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,189 : 28,130 = 28,130 : x
  2. Step 2: Convert to fraction form
    21,189/28,130 = 28,130/x
  3. Step 3: Cross multiply
    21,189x = 28,130 × 28,130
  4. Step 4: Simplify right side
    21,189x = 791,296,900
  5. Step 5: Solve for x
    x = 791,296,900/21,189
  6. Step 6: Final answer
    x = 37,344.70

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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.