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Finding the Fourth Proportional to 213,722.40, 320,161.20 and 187,456.80

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Solution

The fourth proportional to 213,722.40, 320,161.20 and 187,456.80 is: 280,814.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,722.40 : 320,161.20 = 187,456.80 : x
  2. Step 2: Convert to fraction form
    213,722.40/320,161.20 = 187,456.80/x
  3. Step 3: Cross multiply
    213,722.40x = 320,161.20 × 187,456.80
  4. Step 4: Simplify right side
    213,722.40x = 60,016,394,036.16
  5. Step 5: Solve for x
    x = 60,016,394,036.16/213,722.40
  6. Step 6: Final answer
    x = 280,814.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.