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Finding the Fourth Proportional to 281.58, 422.49 and 212.94

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Solution

The fourth proportional to 281.58, 422.49 and 212.94 is: 319.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.58 : 422.49 = 212.94 : x
  2. Step 2: Convert to fraction form
    281.58/422.49 = 212.94/x
  3. Step 3: Cross multiply
    281.58x = 422.49 × 212.94
  4. Step 4: Simplify right side
    281.58x = 89,965.02
  5. Step 5: Solve for x
    x = 89,965.02/281.58
  6. Step 6: Final answer
    x = 319.50

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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.