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Finding the Fourth Proportional to 185.20, 255.32 and 145.78

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Solution

The fourth proportional to 185.20, 255.32 and 145.78 is: 200.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.20 : 255.32 = 145.78 : x
  2. Step 2: Convert to fraction form
    185.20/255.32 = 145.78/x
  3. Step 3: Cross multiply
    185.20x = 255.32 × 145.78
  4. Step 4: Simplify right side
    185.20x = 37,220.55
  5. Step 5: Solve for x
    x = 37,220.55/185.20
  6. Step 6: Final answer
    x = 200.97

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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.