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Finding the Fourth Proportional to 696.40, 961.28 and 401.79

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Solution

The fourth proportional to 696.40, 961.28 and 401.79 is: 554.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.40 : 961.28 = 401.79 : x
  2. Step 2: Convert to fraction form
    696.40/961.28 = 401.79/x
  3. Step 3: Cross multiply
    696.40x = 961.28 × 401.79
  4. Step 4: Simplify right side
    696.40x = 386,232.69
  5. Step 5: Solve for x
    x = 386,232.69/696.40
  6. Step 6: Final answer
    x = 554.61

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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.