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Finding the Fourth Proportional to 281.98, 422.88 and 135.76

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Solution

The fourth proportional to 281.98, 422.88 and 135.76 is: 203.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.98 : 422.88 = 135.76 : x
  2. Step 2: Convert to fraction form
    281.98/422.88 = 135.76/x
  3. Step 3: Cross multiply
    281.98x = 422.88 × 135.76
  4. Step 4: Simplify right side
    281.98x = 57,410.19
  5. Step 5: Solve for x
    x = 57,410.19/281.98
  6. Step 6: Final answer
    x = 203.60

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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.