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Finding the Fourth Proportional to 211.43, 291.78 and 137.85

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Solution

The fourth proportional to 211.43, 291.78 and 137.85 is: 190.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.43 : 291.78 = 137.85 : x
  2. Step 2: Convert to fraction form
    211.43/291.78 = 137.85/x
  3. Step 3: Cross multiply
    211.43x = 291.78 × 137.85
  4. Step 4: Simplify right side
    211.43x = 40,221.87
  5. Step 5: Solve for x
    x = 40,221.87/211.43
  6. Step 6: Final answer
    x = 190.24

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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.