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Finding the Third Proportional to 21,403.50 and 28,400

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Solution

The third proportional to 21,403.50 and 28,400 is: 37,683.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,403.50 : 28,400 = 28,400 : x
  2. Step 2: Convert to fraction form
    21,403.50/28,400 = 28,400/x
  3. Step 3: Cross multiply
    21,403.50x = 28,400 × 28,400
  4. Step 4: Simplify right side
    21,403.50x = 806,560,000
  5. Step 5: Solve for x
    x = 806,560,000/21,403.50
  6. Step 6: Final answer
    x = 37,683.56

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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.