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Finding the Fourth Proportional to 211.67, 316.34 and 156.95

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Solution

The fourth proportional to 211.67, 316.34 and 156.95 is: 234.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.67 : 316.34 = 156.95 : x
  2. Step 2: Convert to fraction form
    211.67/316.34 = 156.95/x
  3. Step 3: Cross multiply
    211.67x = 316.34 × 156.95
  4. Step 4: Simplify right side
    211.67x = 49,649.56
  5. Step 5: Solve for x
    x = 49,649.56/211.67
  6. Step 6: Final answer
    x = 234.56

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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.