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Finding the Fourth Proportional to 287.95, 397.38 and 163.61

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Solution

The fourth proportional to 287.95, 397.38 and 163.61 is: 225.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.95 : 397.38 = 163.61 : x
  2. Step 2: Convert to fraction form
    287.95/397.38 = 163.61/x
  3. Step 3: Cross multiply
    287.95x = 397.38 × 163.61
  4. Step 4: Simplify right side
    287.95x = 65,015.46
  5. Step 5: Solve for x
    x = 65,015.46/287.95
  6. Step 6: Final answer
    x = 225.79

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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.