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Finding the Fourth Proportional to 289.92, 399.96 and 191.78

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Solution

The fourth proportional to 289.92, 399.96 and 191.78 is: 264.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.92 : 399.96 = 191.78 : x
  2. Step 2: Convert to fraction form
    289.92/399.96 = 191.78/x
  3. Step 3: Cross multiply
    289.92x = 399.96 × 191.78
  4. Step 4: Simplify right side
    289.92x = 76,702.33
  5. Step 5: Solve for x
    x = 76,702.33/289.92
  6. Step 6: Final answer
    x = 264.56

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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.