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Finding the Fourth Proportional to 281.36, 422 and 98.76

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Solution

The fourth proportional to 281.36, 422 and 98.76 is: 148.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.36 : 422 = 98.76 : x
  2. Step 2: Convert to fraction form
    281.36/422 = 98.76/x
  3. Step 3: Cross multiply
    281.36x = 422 × 98.76
  4. Step 4: Simplify right side
    281.36x = 41,676.72
  5. Step 5: Solve for x
    x = 41,676.72/281.36
  6. Step 6: Final answer
    x = 148.13

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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.