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Finding the Third Proportional to 270,778 and 420,970

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Solution

The third proportional to 270,778 and 420,970 is: 654,468.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    270,778 : 420,970 = 420,970 : x
  2. Step 2: Convert to fraction form
    270,778/420,970 = 420,970/x
  3. Step 3: Cross multiply
    270,778x = 420,970 × 420,970
  4. Step 4: Simplify right side
    270,778x = 177,215,740,900
  5. Step 5: Solve for x
    x = 177,215,740,900/270,778
  6. Step 6: Final answer
    x = 654,468.76

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.