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Finding the Fourth Proportional to 289.49, 399.38 and 202.22

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Solution

The fourth proportional to 289.49, 399.38 and 202.22 is: 278.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.49 : 399.38 = 202.22 : x
  2. Step 2: Convert to fraction form
    289.49/399.38 = 202.22/x
  3. Step 3: Cross multiply
    289.49x = 399.38 × 202.22
  4. Step 4: Simplify right side
    289.49x = 80,759.62
  5. Step 5: Solve for x
    x = 80,759.62/289.49
  6. Step 6: Final answer
    x = 278.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.