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Finding the Fourth Proportional to 696.78, 961.61 and 398.12

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Solution

The fourth proportional to 696.78, 961.61 and 398.12 is: 549.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.78 : 961.61 = 398.12 : x
  2. Step 2: Convert to fraction form
    696.78/961.61 = 398.12/x
  3. Step 3: Cross multiply
    696.78x = 961.61 × 398.12
  4. Step 4: Simplify right side
    696.78x = 382,836.17
  5. Step 5: Solve for x
    x = 382,836.17/696.78
  6. Step 6: Final answer
    x = 549.44

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Double scale
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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.