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Finding the Fourth Proportional to 211.14, 291 and 171.65

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Solution

The fourth proportional to 211.14, 291 and 171.65 is: 236.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.14 : 291 = 171.65 : x
  2. Step 2: Convert to fraction form
    211.14/291 = 171.65/x
  3. Step 3: Cross multiply
    211.14x = 291 × 171.65
  4. Step 4: Simplify right side
    211.14x = 49,950.15
  5. Step 5: Solve for x
    x = 49,950.15/211.14
  6. Step 6: Final answer
    x = 236.57

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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.