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Finding the Fourth Proportional to 211.10, 316.74 and 137.84

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Solution

The fourth proportional to 211.10, 316.74 and 137.84 is: 206.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.10 : 316.74 = 137.84 : x
  2. Step 2: Convert to fraction form
    211.10/316.74 = 137.84/x
  3. Step 3: Cross multiply
    211.10x = 316.74 × 137.84
  4. Step 4: Simplify right side
    211.10x = 43,659.44
  5. Step 5: Solve for x
    x = 43,659.44/211.10
  6. Step 6: Final answer
    x = 206.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.