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Finding the Fourth Proportional to 135.45, 202.89 and 76.81

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Solution

The fourth proportional to 135.45, 202.89 and 76.81 is: 115.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.45 : 202.89 = 76.81 : x
  2. Step 2: Convert to fraction form
    135.45/202.89 = 76.81/x
  3. Step 3: Cross multiply
    135.45x = 202.89 × 76.81
  4. Step 4: Simplify right side
    135.45x = 15,583.98
  5. Step 5: Solve for x
    x = 15,583.98/135.45
  6. Step 6: Final answer
    x = 115.05

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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.