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Finding the Fourth Proportional to 217.15, 299.81 and 165.22

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Solution

The fourth proportional to 217.15, 299.81 and 165.22 is: 228.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.15 : 299.81 = 165.22 : x
  2. Step 2: Convert to fraction form
    217.15/299.81 = 165.22/x
  3. Step 3: Cross multiply
    217.15x = 299.81 × 165.22
  4. Step 4: Simplify right side
    217.15x = 49,534.27
  5. Step 5: Solve for x
    x = 49,534.27/217.15
  6. Step 6: Final answer
    x = 228.11

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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.