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Finding the Fourth Proportional to 255.12, 352.14 and 189.72

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Solution

The fourth proportional to 255.12, 352.14 and 189.72 is: 261.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.12 : 352.14 = 189.72 : x
  2. Step 2: Convert to fraction form
    255.12/352.14 = 189.72/x
  3. Step 3: Cross multiply
    255.12x = 352.14 × 189.72
  4. Step 4: Simplify right side
    255.12x = 66,808.00
  5. Step 5: Solve for x
    x = 66,808.00/255.12
  6. Step 6: Final answer
    x = 261.87

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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.