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Finding the Third Proportional to 4,215 and 9,120.75

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Solution

The third proportional to 4,215 and 9,120.75 is: 19,736.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,215 : 9,120.75 = 9,120.75 : x
  2. Step 2: Convert to fraction form
    4,215/9,120.75 = 9,120.75/x
  3. Step 3: Cross multiply
    4,215x = 9,120.75 × 9,120.75
  4. Step 4: Simplify right side
    4,215x = 83,188,080.56
  5. Step 5: Solve for x
    x = 83,188,080.56/4,215
  6. Step 6: Final answer
    x = 19,736.20

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.