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Finding the Fourth Proportional to 211.15, 291.41 and 161.94

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Solution

The fourth proportional to 211.15, 291.41 and 161.94 is: 223.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.15 : 291.41 = 161.94 : x
  2. Step 2: Convert to fraction form
    211.15/291.41 = 161.94/x
  3. Step 3: Cross multiply
    211.15x = 291.41 × 161.94
  4. Step 4: Simplify right side
    211.15x = 47,190.94
  5. Step 5: Solve for x
    x = 47,190.94/211.15
  6. Step 6: Final answer
    x = 223.49

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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.