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Finding the Fourth Proportional to 695.49, 1,042.74 and 330.09

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Solution

The fourth proportional to 695.49, 1,042.74 and 330.09 is: 494.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.49 : 1,042.74 = 330.09 : x
  2. Step 2: Convert to fraction form
    695.49/1,042.74 = 330.09/x
  3. Step 3: Cross multiply
    695.49x = 1,042.74 × 330.09
  4. Step 4: Simplify right side
    695.49x = 344,198.05
  5. Step 5: Solve for x
    x = 344,198.05/695.49
  6. Step 6: Final answer
    x = 494.90

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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.