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Finding the Third Proportional to 129.50 and 278.88

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Solution

The third proportional to 129.50 and 278.88 is: 600.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.50 : 278.88 = 278.88 : x
  2. Step 2: Convert to fraction form
    129.50/278.88 = 278.88/x
  3. Step 3: Cross multiply
    129.50x = 278.88 × 278.88
  4. Step 4: Simplify right side
    129.50x = 77,771.27
  5. Step 5: Solve for x
    x = 77,771.27/129.50
  6. Step 6: Final answer
    x = 600.55

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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.