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Finding the Third Proportional to 125.50 and 278.75

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Solution

The third proportional to 125.50 and 278.75 is: 619.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.50 : 278.75 = 278.75 : x
  2. Step 2: Convert to fraction form
    125.50/278.75 = 278.75/x
  3. Step 3: Cross multiply
    125.50x = 278.75 × 278.75
  4. Step 4: Simplify right side
    125.50x = 77,701.56
  5. Step 5: Solve for x
    x = 77,701.56/125.50
  6. Step 6: Final answer
    x = 619.14

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.