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Finding the Fourth Proportional to 135.43, 203.28 and 74.53

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Solution

The fourth proportional to 135.43, 203.28 and 74.53 is: 111.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.43 : 203.28 = 74.53 : x
  2. Step 2: Convert to fraction form
    135.43/203.28 = 74.53/x
  3. Step 3: Cross multiply
    135.43x = 203.28 × 74.53
  4. Step 4: Simplify right side
    135.43x = 15,150.46
  5. Step 5: Solve for x
    x = 15,150.46/135.43
  6. Step 6: Final answer
    x = 111.87

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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.