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Finding the Fourth Proportional to 213.78, 294.78 and 164.55

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Solution

The fourth proportional to 213.78, 294.78 and 164.55 is: 226.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.78 : 294.78 = 164.55 : x
  2. Step 2: Convert to fraction form
    213.78/294.78 = 164.55/x
  3. Step 3: Cross multiply
    213.78x = 294.78 × 164.55
  4. Step 4: Simplify right side
    213.78x = 48,506.05
  5. Step 5: Solve for x
    x = 48,506.05/213.78
  6. Step 6: Final answer
    x = 226.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.