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Finding the Fourth Proportional to 165, 227.65 and 115.21

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Solution

The fourth proportional to 165, 227.65 and 115.21 is: 158.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    165 : 227.65 = 115.21 : x
  2. Step 2: Convert to fraction form
    165/227.65 = 115.21/x
  3. Step 3: Cross multiply
    165x = 227.65 × 115.21
  4. Step 4: Simplify right side
    165x = 26,225.84
  5. Step 5: Solve for x
    x = 26,225.84/165
  6. Step 6: Final answer
    x = 158.94

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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.