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Finding the Fourth Proportional to 234.49, 323.72 and 155.78

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Solution

The fourth proportional to 234.49, 323.72 and 155.78 is: 215.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    234.49 : 323.72 = 155.78 : x
  2. Step 2: Convert to fraction form
    234.49/323.72 = 155.78/x
  3. Step 3: Cross multiply
    234.49x = 323.72 × 155.78
  4. Step 4: Simplify right side
    234.49x = 50,429.10
  5. Step 5: Solve for x
    x = 50,429.10/234.49
  6. Step 6: Final answer
    x = 215.06

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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.