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Finding the Fourth Proportional to 213.35, 318 and 197.78

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Solution

The fourth proportional to 213.35, 318 and 197.78 is: 294.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.35 : 318 = 197.78 : x
  2. Step 2: Convert to fraction form
    213.35/318 = 197.78/x
  3. Step 3: Cross multiply
    213.35x = 318 × 197.78
  4. Step 4: Simplify right side
    213.35x = 62,892.45
  5. Step 5: Solve for x
    x = 62,892.45/213.35
  6. Step 6: Final answer
    x = 294.79

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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.