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Finding the Fourth Proportional to 559.72, 838 and 394.80

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Solution

The fourth proportional to 559.72, 838 and 394.80 is: 591.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.72 : 838 = 394.80 : x
  2. Step 2: Convert to fraction form
    559.72/838 = 394.80/x
  3. Step 3: Cross multiply
    559.72x = 838 × 394.80
  4. Step 4: Simplify right side
    559.72x = 330,842.40
  5. Step 5: Solve for x
    x = 330,842.40/559.72
  6. Step 6: Final answer
    x = 591.09

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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.