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Finding the Fourth Proportional to 287.67, 396.86 and 194.38

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Solution

The fourth proportional to 287.67, 396.86 and 194.38 is: 268.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.67 : 396.86 = 194.38 : x
  2. Step 2: Convert to fraction form
    287.67/396.86 = 194.38/x
  3. Step 3: Cross multiply
    287.67x = 396.86 × 194.38
  4. Step 4: Simplify right side
    287.67x = 77,140.38
  5. Step 5: Solve for x
    x = 77,140.38/287.67
  6. Step 6: Final answer
    x = 268.16

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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.