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Finding the Fourth Proportional to 386,272.80, 579,409.20 and 218,311.20

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Solution

The fourth proportional to 386,272.80, 579,409.20 and 218,311.20 is: 327,466.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,272.80 : 579,409.20 = 218,311.20 : x
  2. Step 2: Convert to fraction form
    386,272.80/579,409.20 = 218,311.20/x
  3. Step 3: Cross multiply
    386,272.80x = 579,409.20 × 218,311.20
  4. Step 4: Simplify right side
    386,272.80x = 126,491,517,743.04
  5. Step 5: Solve for x
    x = 126,491,517,743.04/386,272.80
  6. Step 6: Final answer
    x = 327,466.80

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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.