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Finding the Fourth Proportional to 354.28, 531.42 and 126.28

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Solution

The fourth proportional to 354.28, 531.42 and 126.28 is: 189.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.28 : 531.42 = 126.28 : x
  2. Step 2: Convert to fraction form
    354.28/531.42 = 126.28/x
  3. Step 3: Cross multiply
    354.28x = 531.42 × 126.28
  4. Step 4: Simplify right side
    354.28x = 67,107.72
  5. Step 5: Solve for x
    x = 67,107.72/354.28
  6. Step 6: Final answer
    x = 189.42

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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.