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Finding the Fourth Proportional to 213.05, 319.45 and 115.66

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Solution

The fourth proportional to 213.05, 319.45 and 115.66 is: 173.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.05 : 319.45 = 115.66 : x
  2. Step 2: Convert to fraction form
    213.05/319.45 = 115.66/x
  3. Step 3: Cross multiply
    213.05x = 319.45 × 115.66
  4. Step 4: Simplify right side
    213.05x = 36,946.50
  5. Step 5: Solve for x
    x = 36,946.50/213.05
  6. Step 6: Final answer
    x = 173.42

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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.