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Finding the Fourth Proportional to 281.78, 422.39 and 135.32

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Solution

The fourth proportional to 281.78, 422.39 and 135.32 is: 202.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.78 : 422.39 = 135.32 : x
  2. Step 2: Convert to fraction form
    281.78/422.39 = 135.32/x
  3. Step 3: Cross multiply
    281.78x = 422.39 × 135.32
  4. Step 4: Simplify right side
    281.78x = 57,155.03
  5. Step 5: Solve for x
    x = 57,155.03/281.78
  6. Step 6: Final answer
    x = 202.84

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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.