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Finding the Third Proportional to 129,758 and 278,915

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Solution

The third proportional to 129,758 and 278,915 is: 599,528.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,758 : 278,915 = 278,915 : x
  2. Step 2: Convert to fraction form
    129,758/278,915 = 278,915/x
  3. Step 3: Cross multiply
    129,758x = 278,915 × 278,915
  4. Step 4: Simplify right side
    129,758x = 77,793,577,225
  5. Step 5: Solve for x
    x = 77,793,577,225/129,758
  6. Step 6: Final answer
    x = 599,528.18

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.