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Finding the Third Proportional to 9,999.38 and 21,228.75

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Solution

The third proportional to 9,999.38 and 21,228.75 is: 45,068.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,999.38 : 21,228.75 = 21,228.75 : x
  2. Step 2: Convert to fraction form
    9,999.38/21,228.75 = 21,228.75/x
  3. Step 3: Cross multiply
    9,999.38x = 21,228.75 × 21,228.75
  4. Step 4: Simplify right side
    9,999.38x = 450,659,826.56
  5. Step 5: Solve for x
    x = 450,659,826.56/9,999.38
  6. Step 6: Final answer
    x = 45,068.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.