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Finding the Fourth Proportional to 281.06, 421.18 and 208.97

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Solution

The fourth proportional to 281.06, 421.18 and 208.97 is: 313.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.06 : 421.18 = 208.97 : x
  2. Step 2: Convert to fraction form
    281.06/421.18 = 208.97/x
  3. Step 3: Cross multiply
    281.06x = 421.18 × 208.97
  4. Step 4: Simplify right side
    281.06x = 88,013.98
  5. Step 5: Solve for x
    x = 88,013.98/281.06
  6. Step 6: Final answer
    x = 313.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.