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Finding the Third Proportional to 21,129.75 and 28,459.13

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Solution

The third proportional to 21,129.75 and 28,459.13 is: 38,330.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,129.75 : 28,459.13 = 28,459.13 : x
  2. Step 2: Convert to fraction form
    21,129.75/28,459.13 = 28,459.13/x
  3. Step 3: Cross multiply
    21,129.75x = 28,459.13 × 28,459.13
  4. Step 4: Simplify right side
    21,129.75x = 809,921,795.77
  5. Step 5: Solve for x
    x = 809,921,795.77/21,129.75
  6. Step 6: Final answer
    x = 38,330.87

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.