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Finding the Third Proportional to 125.25 and 278.25

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Solution

The third proportional to 125.25 and 278.25 is: 618.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.25 : 278.25 = 278.25 : x
  2. Step 2: Convert to fraction form
    125.25/278.25 = 278.25/x
  3. Step 3: Cross multiply
    125.25x = 278.25 × 278.25
  4. Step 4: Simplify right side
    125.25x = 77,423.06
  5. Step 5: Solve for x
    x = 77,423.06/125.25
  6. Step 6: Final answer
    x = 618.15

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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.