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Finding the Fourth Proportional to 135.51, 203.37 and 108.78

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Solution

The fourth proportional to 135.51, 203.37 and 108.78 is: 163.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.51 : 203.37 = 108.78 : x
  2. Step 2: Convert to fraction form
    135.51/203.37 = 108.78/x
  3. Step 3: Cross multiply
    135.51x = 203.37 × 108.78
  4. Step 4: Simplify right side
    135.51x = 22,122.04
  5. Step 5: Solve for x
    x = 22,122.04/135.51
  6. Step 6: Final answer
    x = 163.25

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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.