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Finding the Fourth Proportional to 211.75, 316.10 and 188.73

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Solution

The fourth proportional to 211.75, 316.10 and 188.73 is: 281.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.75 : 316.10 = 188.73 : x
  2. Step 2: Convert to fraction form
    211.75/316.10 = 188.73/x
  3. Step 3: Cross multiply
    211.75x = 316.10 × 188.73
  4. Step 4: Simplify right side
    211.75x = 59,658.02
  5. Step 5: Solve for x
    x = 59,658.02/211.75
  6. Step 6: Final answer
    x = 281.74

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.