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Finding the Fourth Proportional to 291.28, 401.24 and 217.48

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Solution

The fourth proportional to 291.28, 401.24 and 217.48 is: 299.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.28 : 401.24 = 217.48 : x
  2. Step 2: Convert to fraction form
    291.28/401.24 = 217.48/x
  3. Step 3: Cross multiply
    291.28x = 401.24 × 217.48
  4. Step 4: Simplify right side
    291.28x = 87,261.68
  5. Step 5: Solve for x
    x = 87,261.68/291.28
  6. Step 6: Final answer
    x = 299.58

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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.