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Finding the Fourth Proportional to 255.42, 352.52 and 155.85

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Solution

The fourth proportional to 255.42, 352.52 and 155.85 is: 215.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.42 : 352.52 = 155.85 : x
  2. Step 2: Convert to fraction form
    255.42/352.52 = 155.85/x
  3. Step 3: Cross multiply
    255.42x = 352.52 × 155.85
  4. Step 4: Simplify right side
    255.42x = 54,938.14
  5. Step 5: Solve for x
    x = 54,938.14/255.42
  6. Step 6: Final answer
    x = 215.09

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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.