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Finding the Fourth Proportional to 135.53, 203.40 and 54.43

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Solution

The fourth proportional to 135.53, 203.40 and 54.43 is: 81.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.53 : 203.40 = 54.43 : x
  2. Step 2: Convert to fraction form
    135.53/203.40 = 54.43/x
  3. Step 3: Cross multiply
    135.53x = 203.40 × 54.43
  4. Step 4: Simplify right side
    135.53x = 11,070.55
  5. Step 5: Solve for x
    x = 11,070.55/135.53
  6. Step 6: Final answer
    x = 81.68

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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.