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Finding the Fourth Proportional to 255.15, 351.99 and 189.54

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Solution

The fourth proportional to 255.15, 351.99 and 189.54 is: 261.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.15 : 351.99 = 189.54 : x
  2. Step 2: Convert to fraction form
    255.15/351.99 = 189.54/x
  3. Step 3: Cross multiply
    255.15x = 351.99 × 189.54
  4. Step 4: Simplify right side
    255.15x = 66,716.18
  5. Step 5: Solve for x
    x = 66,716.18/255.15
  6. Step 6: Final answer
    x = 261.48

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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.