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Finding the Fourth Proportional to 277.20, 415.28 and 189.31

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Solution

The fourth proportional to 277.20, 415.28 and 189.31 is: 283.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    277.20 : 415.28 = 189.31 : x
  2. Step 2: Convert to fraction form
    277.20/415.28 = 189.31/x
  3. Step 3: Cross multiply
    277.20x = 415.28 × 189.31
  4. Step 4: Simplify right side
    277.20x = 78,614.58
  5. Step 5: Solve for x
    x = 78,614.58/277.20
  6. Step 6: Final answer
    x = 283.61

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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.