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Finding the Third Proportional to 20,428.50 and 28,908

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Solution

The third proportional to 20,428.50 and 28,908 is: 40,907.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,428.50 : 28,908 = 28,908 : x
  2. Step 2: Convert to fraction form
    20,428.50/28,908 = 28,908/x
  3. Step 3: Cross multiply
    20,428.50x = 28,908 × 28,908
  4. Step 4: Simplify right side
    20,428.50x = 835,672,464
  5. Step 5: Solve for x
    x = 835,672,464/20,428.50
  6. Step 6: Final answer
    x = 40,907.19

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.