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Finding the Fourth Proportional to 394,079.50, 543,842.67 and 215,231.50

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Solution

The fourth proportional to 394,079.50, 543,842.67 and 215,231.50 is: 297,026.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,079.50 : 543,842.67 = 215,231.50 : x
  2. Step 2: Convert to fraction form
    394,079.50/543,842.67 = 215,231.50/x
  3. Step 3: Cross multiply
    394,079.50x = 543,842.67 × 215,231.50
  4. Step 4: Simplify right side
    394,079.50x = 117,052,073,628.11
  5. Step 5: Solve for x
    x = 117,052,073,628.11/394,079.50
  6. Step 6: Final answer
    x = 297,026.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.