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Finding the Fourth Proportional to 213.31, 319.70 and 115.86

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Solution

The fourth proportional to 213.31, 319.70 and 115.86 is: 173.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.31 : 319.70 = 115.86 : x
  2. Step 2: Convert to fraction form
    213.31/319.70 = 115.86/x
  3. Step 3: Cross multiply
    213.31x = 319.70 × 115.86
  4. Step 4: Simplify right side
    213.31x = 37,040.44
  5. Step 5: Solve for x
    x = 37,040.44/213.31
  6. Step 6: Final answer
    x = 173.65

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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.