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Finding the Fourth Proportional to 281.34, 387.78 and 198.30

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Solution

The fourth proportional to 281.34, 387.78 and 198.30 is: 273.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.34 : 387.78 = 198.30 : x
  2. Step 2: Convert to fraction form
    281.34/387.78 = 198.30/x
  3. Step 3: Cross multiply
    281.34x = 387.78 × 198.30
  4. Step 4: Simplify right side
    281.34x = 76,896.77
  5. Step 5: Solve for x
    x = 76,896.77/281.34
  6. Step 6: Final answer
    x = 273.32

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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.