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Finding the Fourth Proportional to 291, 401.28 and 203.64

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Solution

The fourth proportional to 291, 401.28 and 203.64 is: 280.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    291 : 401.28 = 203.64 : x
  2. Step 2: Convert to fraction form
    291/401.28 = 203.64/x
  3. Step 3: Cross multiply
    291x = 401.28 × 203.64
  4. Step 4: Simplify right side
    291x = 81,716.66
  5. Step 5: Solve for x
    x = 81,716.66/291
  6. Step 6: Final answer
    x = 280.81

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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.