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Finding the Fourth Proportional to 281.91, 422.85 and 89.55

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Solution

The fourth proportional to 281.91, 422.85 and 89.55 is: 134.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.91 : 422.85 = 89.55 : x
  2. Step 2: Convert to fraction form
    281.91/422.85 = 89.55/x
  3. Step 3: Cross multiply
    281.91x = 422.85 × 89.55
  4. Step 4: Simplify right side
    281.91x = 37,866.22
  5. Step 5: Solve for x
    x = 37,866.22/281.91
  6. Step 6: Final answer
    x = 134.32

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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.