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Finding the Third Proportional to 5,115 and 10,891.50

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Solution

The third proportional to 5,115 and 10,891.50 is: 23,191.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,115 : 10,891.50 = 10,891.50 : x
  2. Step 2: Convert to fraction form
    5,115/10,891.50 = 10,891.50/x
  3. Step 3: Cross multiply
    5,115x = 10,891.50 × 10,891.50
  4. Step 4: Simplify right side
    5,115x = 118,624,772.25
  5. Step 5: Solve for x
    x = 118,624,772.25/5,115
  6. Step 6: Final answer
    x = 23,191.55

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.