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Finding the Fourth Proportional to 281.79, 422.48 and 108.31

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Solution

The fourth proportional to 281.79, 422.48 and 108.31 is: 162.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.79 : 422.48 = 108.31 : x
  2. Step 2: Convert to fraction form
    281.79/422.48 = 108.31/x
  3. Step 3: Cross multiply
    281.79x = 422.48 × 108.31
  4. Step 4: Simplify right side
    281.79x = 45,758.81
  5. Step 5: Solve for x
    x = 45,758.81/281.79
  6. Step 6: Final answer
    x = 162.39

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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.