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Finding the Fourth Proportional to 696.39, 961.07 and 447.79

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Solution

The fourth proportional to 696.39, 961.07 and 447.79 is: 617.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.39 : 961.07 = 447.79 : x
  2. Step 2: Convert to fraction form
    696.39/961.07 = 447.79/x
  3. Step 3: Cross multiply
    696.39x = 961.07 × 447.79
  4. Step 4: Simplify right side
    696.39x = 430,357.54
  5. Step 5: Solve for x
    x = 430,357.54/696.39
  6. Step 6: Final answer
    x = 617.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.