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Finding the Fourth Proportional to 135.71, 203.25 and 81.48

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Solution

The fourth proportional to 135.71, 203.25 and 81.48 is: 122.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.71 : 203.25 = 81.48 : x
  2. Step 2: Convert to fraction form
    135.71/203.25 = 81.48/x
  3. Step 3: Cross multiply
    135.71x = 203.25 × 81.48
  4. Step 4: Simplify right side
    135.71x = 16,560.81
  5. Step 5: Solve for x
    x = 16,560.81/135.71
  6. Step 6: Final answer
    x = 122.03

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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.