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Finding the Fourth Proportional to 211.62, 292.08 and 137.81

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Solution

The fourth proportional to 211.62, 292.08 and 137.81 is: 190.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.62 : 292.08 = 137.81 : x
  2. Step 2: Convert to fraction form
    211.62/292.08 = 137.81/x
  3. Step 3: Cross multiply
    211.62x = 292.08 × 137.81
  4. Step 4: Simplify right side
    211.62x = 40,251.54
  5. Step 5: Solve for x
    x = 40,251.54/211.62
  6. Step 6: Final answer
    x = 190.21

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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.