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Finding the Third Proportional to 215,424 and 338,820

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Solution

The third proportional to 215,424 and 338,820 is: 532,897.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,424 : 338,820 = 338,820 : x
  2. Step 2: Convert to fraction form
    215,424/338,820 = 338,820/x
  3. Step 3: Cross multiply
    215,424x = 338,820 × 338,820
  4. Step 4: Simplify right side
    215,424x = 114,798,992,400
  5. Step 5: Solve for x
    x = 114,798,992,400/215,424
  6. Step 6: Final answer
    x = 532,897.88

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.