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Finding the Third Proportional to 40,357.50 and 79,680

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Solution

The third proportional to 40,357.50 and 79,680 is: 157,316.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,357.50 : 79,680 = 79,680 : x
  2. Step 2: Convert to fraction form
    40,357.50/79,680 = 79,680/x
  3. Step 3: Cross multiply
    40,357.50x = 79,680 × 79,680
  4. Step 4: Simplify right side
    40,357.50x = 6,348,902,400
  5. Step 5: Solve for x
    x = 6,348,902,400/40,357.50
  6. Step 6: Final answer
    x = 157,316.54

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Why These Related Problems?

These problems maintain the same ratio (1.97) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.