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Finding the Fourth Proportional to 270.80, 405.28 and 189.39

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Solution

The fourth proportional to 270.80, 405.28 and 189.39 is: 283.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    270.80 : 405.28 = 189.39 : x
  2. Step 2: Convert to fraction form
    270.80/405.28 = 189.39/x
  3. Step 3: Cross multiply
    270.80x = 405.28 × 189.39
  4. Step 4: Simplify right side
    270.80x = 76,755.98
  5. Step 5: Solve for x
    x = 76,755.98/270.80
  6. Step 6: Final answer
    x = 283.44

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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.