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Finding the Fourth Proportional to 281.95, 422.72 and 135.70

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Solution

The fourth proportional to 281.95, 422.72 and 135.70 is: 203.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.95 : 422.72 = 135.70 : x
  2. Step 2: Convert to fraction form
    281.95/422.72 = 135.70/x
  3. Step 3: Cross multiply
    281.95x = 422.72 × 135.70
  4. Step 4: Simplify right side
    281.95x = 57,363.10
  5. Step 5: Solve for x
    x = 57,363.10/281.95
  6. Step 6: Final answer
    x = 203.45

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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.