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Finding the Fourth Proportional to 255.39, 382.77 and 187.20

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Solution

The fourth proportional to 255.39, 382.77 and 187.20 is: 280.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.39 : 382.77 = 187.20 : x
  2. Step 2: Convert to fraction form
    255.39/382.77 = 187.20/x
  3. Step 3: Cross multiply
    255.39x = 382.77 × 187.20
  4. Step 4: Simplify right side
    255.39x = 71,654.54
  5. Step 5: Solve for x
    x = 71,654.54/255.39
  6. Step 6: Final answer
    x = 280.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.