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Finding the Fourth Proportional to 135.21, 202.81 and 54.05

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Solution

The fourth proportional to 135.21, 202.81 and 54.05 is: 81.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.21 : 202.81 = 54.05 : x
  2. Step 2: Convert to fraction form
    135.21/202.81 = 54.05/x
  3. Step 3: Cross multiply
    135.21x = 202.81 × 54.05
  4. Step 4: Simplify right side
    135.21x = 10,961.24
  5. Step 5: Solve for x
    x = 10,961.24/135.21
  6. Step 6: Final answer
    x = 81.07

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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.