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Finding the Fourth Proportional to 211.88, 292.39 and 118.61

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Solution

The fourth proportional to 211.88, 292.39 and 118.61 is: 163.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.88 : 292.39 = 118.61 : x
  2. Step 2: Convert to fraction form
    211.88/292.39 = 118.61/x
  3. Step 3: Cross multiply
    211.88x = 292.39 × 118.61
  4. Step 4: Simplify right side
    211.88x = 34,680.38
  5. Step 5: Solve for x
    x = 34,680.38/211.88
  6. Step 6: Final answer
    x = 163.68

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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.