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Finding the Third Proportional to 918.75 and 1,999.50

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Solution

The third proportional to 918.75 and 1,999.50 is: 4,351.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.75 : 1,999.50 = 1,999.50 : x
  2. Step 2: Convert to fraction form
    918.75/1,999.50 = 1,999.50/x
  3. Step 3: Cross multiply
    918.75x = 1,999.50 × 1,999.50
  4. Step 4: Simplify right side
    918.75x = 3,998,000.25
  5. Step 5: Solve for x
    x = 3,998,000.25/918.75
  6. Step 6: Final answer
    x = 4,351.56

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.