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Finding the Fourth Proportional to 1,489.82, 2,234.70 and 394.28

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Solution

The fourth proportional to 1,489.82, 2,234.70 and 394.28 is: 591.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.82 : 2,234.70 = 394.28 : x
  2. Step 2: Convert to fraction form
    1,489.82/2,234.70 = 394.28/x
  3. Step 3: Cross multiply
    1,489.82x = 2,234.70 × 394.28
  4. Step 4: Simplify right side
    1,489.82x = 881,097.52
  5. Step 5: Solve for x
    x = 881,097.52/1,489.82
  6. Step 6: Final answer
    x = 591.41

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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.