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Finding the Fourth Proportional to 281.58, 422.11 and 98.86

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Solution

The fourth proportional to 281.58, 422.11 and 98.86 is: 148.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.58 : 422.11 = 98.86 : x
  2. Step 2: Convert to fraction form
    281.58/422.11 = 98.86/x
  3. Step 3: Cross multiply
    281.58x = 422.11 × 98.86
  4. Step 4: Simplify right side
    281.58x = 41,729.65
  5. Step 5: Solve for x
    x = 41,729.65/281.58
  6. Step 6: Final answer
    x = 148.20

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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.