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Finding the Third Proportional to 285,178.50 and 398,721

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Solution

The third proportional to 285,178.50 and 398,721 is: 557,469.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,178.50 : 398,721 = 398,721 : x
  2. Step 2: Convert to fraction form
    285,178.50/398,721 = 398,721/x
  3. Step 3: Cross multiply
    285,178.50x = 398,721 × 398,721
  4. Step 4: Simplify right side
    285,178.50x = 158,978,435,841
  5. Step 5: Solve for x
    x = 158,978,435,841/285,178.50
  6. Step 6: Final answer
    x = 557,469.92

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.