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Finding the Fourth Proportional to 297.81, 411.21 and 199.80

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Solution

The fourth proportional to 297.81, 411.21 and 199.80 is: 275.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    297.81 : 411.21 = 199.80 : x
  2. Step 2: Convert to fraction form
    297.81/411.21 = 199.80/x
  3. Step 3: Cross multiply
    297.81x = 411.21 × 199.80
  4. Step 4: Simplify right side
    297.81x = 82,159.76
  5. Step 5: Solve for x
    x = 82,159.76/297.81
  6. Step 6: Final answer
    x = 275.88

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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.