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Finding the Third Proportional to 21,228.75 and 31,218.75

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Solution

The third proportional to 21,228.75 and 31,218.75 is: 45,909.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,228.75 : 31,218.75 = 31,218.75 : x
  2. Step 2: Convert to fraction form
    21,228.75/31,218.75 = 31,218.75/x
  3. Step 3: Cross multiply
    21,228.75x = 31,218.75 × 31,218.75
  4. Step 4: Simplify right side
    21,228.75x = 974,610,351.56
  5. Step 5: Solve for x
    x = 974,610,351.56/21,228.75
  6. Step 6: Final answer
    x = 45,909.93

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.