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Finding the Fourth Proportional to 135.80, 203.49 and 74.78

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Solution

The fourth proportional to 135.80, 203.49 and 74.78 is: 112.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.80 : 203.49 = 74.78 : x
  2. Step 2: Convert to fraction form
    135.80/203.49 = 74.78/x
  3. Step 3: Cross multiply
    135.80x = 203.49 × 74.78
  4. Step 4: Simplify right side
    135.80x = 15,216.98
  5. Step 5: Solve for x
    x = 15,216.98/135.80
  6. Step 6: Final answer
    x = 112.05

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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.