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Finding the Fourth Proportional to 320,470.20, 480,705.30 and 225,991.80

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Solution

The fourth proportional to 320,470.20, 480,705.30 and 225,991.80 is: 338,987.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,470.20 : 480,705.30 = 225,991.80 : x
  2. Step 2: Convert to fraction form
    320,470.20/480,705.30 = 225,991.80/x
  3. Step 3: Cross multiply
    320,470.20x = 480,705.30 × 225,991.80
  4. Step 4: Simplify right side
    320,470.20x = 108,635,456,016.54
  5. Step 5: Solve for x
    x = 108,635,456,016.54/320,470.20
  6. Step 6: Final answer
    x = 338,987.70

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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.