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Finding the Fourth Proportional to 135.15, 203.58 and 111.39

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Solution

The fourth proportional to 135.15, 203.58 and 111.39 is: 167.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.15 : 203.58 = 111.39 : x
  2. Step 2: Convert to fraction form
    135.15/203.58 = 111.39/x
  3. Step 3: Cross multiply
    135.15x = 203.58 × 111.39
  4. Step 4: Simplify right side
    135.15x = 22,676.78
  5. Step 5: Solve for x
    x = 22,676.78/135.15
  6. Step 6: Final answer
    x = 167.79

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.