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Finding the Fourth Proportional to 297.88, 411.20 and 199.68

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Solution

The fourth proportional to 297.88, 411.20 and 199.68 is: 275.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    297.88 : 411.20 = 199.68 : x
  2. Step 2: Convert to fraction form
    297.88/411.20 = 199.68/x
  3. Step 3: Cross multiply
    297.88x = 411.20 × 199.68
  4. Step 4: Simplify right side
    297.88x = 82,108.42
  5. Step 5: Solve for x
    x = 82,108.42/297.88
  6. Step 6: Final answer
    x = 275.64

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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.