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Finding the Fourth Proportional to 281.36, 387.98 and 198.51

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Solution

The fourth proportional to 281.36, 387.98 and 198.51 is: 273.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.36 : 387.98 = 198.51 : x
  2. Step 2: Convert to fraction form
    281.36/387.98 = 198.51/x
  3. Step 3: Cross multiply
    281.36x = 387.98 × 198.51
  4. Step 4: Simplify right side
    281.36x = 77,017.91
  5. Step 5: Solve for x
    x = 77,017.91/281.36
  6. Step 6: Final answer
    x = 273.73

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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.