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Finding the Fourth Proportional to 1,489.78, 2,234.42 and 394.21

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Solution

The fourth proportional to 1,489.78, 2,234.42 and 394.21 is: 591.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.78 : 2,234.42 = 394.21 : x
  2. Step 2: Convert to fraction form
    1,489.78/2,234.42 = 394.21/x
  3. Step 3: Cross multiply
    1,489.78x = 2,234.42 × 394.21
  4. Step 4: Simplify right side
    1,489.78x = 880,817.57
  5. Step 5: Solve for x
    x = 880,817.57/1,489.78
  6. Step 6: Final answer
    x = 591.24

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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.