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Finding the Fourth Proportional to 281.82, 422.72 and 89.45

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Solution

The fourth proportional to 281.82, 422.72 and 89.45 is: 134.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.82 : 422.72 = 89.45 : x
  2. Step 2: Convert to fraction form
    281.82/422.72 = 89.45/x
  3. Step 3: Cross multiply
    281.82x = 422.72 × 89.45
  4. Step 4: Simplify right side
    281.82x = 37,809.74
  5. Step 5: Solve for x
    x = 37,809.74/281.82
  6. Step 6: Final answer
    x = 134.16

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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.