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Finding the Fourth Proportional to 695.39, 1,043.36 and 330.49

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Solution

The fourth proportional to 695.39, 1,043.36 and 330.49 is: 495.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.39 : 1,043.36 = 330.49 : x
  2. Step 2: Convert to fraction form
    695.39/1,043.36 = 330.49/x
  3. Step 3: Cross multiply
    695.39x = 1,043.36 × 330.49
  4. Step 4: Simplify right side
    695.39x = 344,820.05
  5. Step 5: Solve for x
    x = 344,820.05/695.39
  6. Step 6: Final answer
    x = 495.87

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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.