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Finding the Fourth Proportional to 135.72, 203.57 and 67.22

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Solution

The fourth proportional to 135.72, 203.57 and 67.22 is: 100.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.72 : 203.57 = 67.22 : x
  2. Step 2: Convert to fraction form
    135.72/203.57 = 67.22/x
  3. Step 3: Cross multiply
    135.72x = 203.57 × 67.22
  4. Step 4: Simplify right side
    135.72x = 13,683.98
  5. Step 5: Solve for x
    x = 13,683.98/135.72
  6. Step 6: Final answer
    x = 100.83

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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.