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Finding the Fourth Proportional to 291.05, 400.86 and 217.25

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Solution

The fourth proportional to 291.05, 400.86 and 217.25 is: 299.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.05 : 400.86 = 217.25 : x
  2. Step 2: Convert to fraction form
    291.05/400.86 = 217.25/x
  3. Step 3: Cross multiply
    291.05x = 400.86 × 217.25
  4. Step 4: Simplify right side
    291.05x = 87,086.84
  5. Step 5: Solve for x
    x = 87,086.84/291.05
  6. Step 6: Final answer
    x = 299.22

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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.