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Finding the Fourth Proportional to 211.47, 291.66 and 196.11

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Solution

The fourth proportional to 211.47, 291.66 and 196.11 is: 270.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.47 : 291.66 = 196.11 : x
  2. Step 2: Convert to fraction form
    211.47/291.66 = 196.11/x
  3. Step 3: Cross multiply
    211.47x = 291.66 × 196.11
  4. Step 4: Simplify right side
    211.47x = 57,197.44
  5. Step 5: Solve for x
    x = 57,197.44/211.47
  6. Step 6: Final answer
    x = 270.48

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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.