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Finding the Fourth Proportional to 202.76, 303.95 and 81.11

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Solution

The fourth proportional to 202.76, 303.95 and 81.11 is: 121.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.76 : 303.95 = 81.11 : x
  2. Step 2: Convert to fraction form
    202.76/303.95 = 81.11/x
  3. Step 3: Cross multiply
    202.76x = 303.95 × 81.11
  4. Step 4: Simplify right side
    202.76x = 24,651.86
  5. Step 5: Solve for x
    x = 24,651.86/202.76
  6. Step 6: Final answer
    x = 121.58

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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.