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Finding the Fourth Proportional to 255.42, 351.81 and 189.81

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Solution

The fourth proportional to 255.42, 351.81 and 189.81 is: 261.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.42 : 351.81 = 189.81 : x
  2. Step 2: Convert to fraction form
    255.42/351.81 = 189.81/x
  3. Step 3: Cross multiply
    255.42x = 351.81 × 189.81
  4. Step 4: Simplify right side
    255.42x = 66,777.06
  5. Step 5: Solve for x
    x = 66,777.06/255.42
  6. Step 6: Final answer
    x = 261.44

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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.