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Finding the Fourth Proportional to 696.21, 961.11 and 401.42

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Solution

The fourth proportional to 696.21, 961.11 and 401.42 is: 554.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.21 : 961.11 = 401.42 : x
  2. Step 2: Convert to fraction form
    696.21/961.11 = 401.42/x
  3. Step 3: Cross multiply
    696.21x = 961.11 × 401.42
  4. Step 4: Simplify right side
    696.21x = 385,808.78
  5. Step 5: Solve for x
    x = 385,808.78/696.21
  6. Step 6: Final answer
    x = 554.16

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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.