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Finding the Fourth Proportional to 696.82, 961.64 and 398.14

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Solution

The fourth proportional to 696.82, 961.64 and 398.14 is: 549.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.82 : 961.64 = 398.14 : x
  2. Step 2: Convert to fraction form
    696.82/961.64 = 398.14/x
  3. Step 3: Cross multiply
    696.82x = 961.64 × 398.14
  4. Step 4: Simplify right side
    696.82x = 382,867.35
  5. Step 5: Solve for x
    x = 382,867.35/696.82
  6. Step 6: Final answer
    x = 549.45

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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.