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Finding the Fourth Proportional to 202.05, 303.20 and 78.74

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Solution

The fourth proportional to 202.05, 303.20 and 78.74 is: 118.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.05 : 303.20 = 78.74 : x
  2. Step 2: Convert to fraction form
    202.05/303.20 = 78.74/x
  3. Step 3: Cross multiply
    202.05x = 303.20 × 78.74
  4. Step 4: Simplify right side
    202.05x = 23,872.06
  5. Step 5: Solve for x
    x = 23,872.06/202.05
  6. Step 6: Final answer
    x = 118.15

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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.