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Finding the Fourth Proportional to 291.07, 401.86 and 217.27

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Solution

The fourth proportional to 291.07, 401.86 and 217.27 is: 299.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.07 : 401.86 = 217.27 : x
  2. Step 2: Convert to fraction form
    291.07/401.86 = 217.27/x
  3. Step 3: Cross multiply
    291.07x = 401.86 × 217.27
  4. Step 4: Simplify right side
    291.07x = 87,312.12
  5. Step 5: Solve for x
    x = 87,312.12/291.07
  6. Step 6: Final answer
    x = 299.97

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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.