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Finding the Third Proportional to 873.50 and 1,909

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Solution

The third proportional to 873.50 and 1,909 is: 4,172.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.50 : 1,909 = 1,909 : x
  2. Step 2: Convert to fraction form
    873.50/1,909 = 1,909/x
  3. Step 3: Cross multiply
    873.50x = 1,909 × 1,909
  4. Step 4: Simplify right side
    873.50x = 3,644,281
  5. Step 5: Solve for x
    x = 3,644,281/873.50
  6. Step 6: Final answer
    x = 4,172.04

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.