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Finding the Fourth Proportional to 696.54, 961.15 and 397.80

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Solution

The fourth proportional to 696.54, 961.15 and 397.80 is: 548.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.54 : 961.15 = 397.80 : x
  2. Step 2: Convert to fraction form
    696.54/961.15 = 397.80/x
  3. Step 3: Cross multiply
    696.54x = 961.15 × 397.80
  4. Step 4: Simplify right side
    696.54x = 382,344.48
  5. Step 5: Solve for x
    x = 382,344.48/696.54
  6. Step 6: Final answer
    x = 548.92

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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.