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Finding the Fourth Proportional to 203.69, 305.64 and 112.43

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Solution

The fourth proportional to 203.69, 305.64 and 112.43 is: 168.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.69 : 305.64 = 112.43 : x
  2. Step 2: Convert to fraction form
    203.69/305.64 = 112.43/x
  3. Step 3: Cross multiply
    203.69x = 305.64 × 112.43
  4. Step 4: Simplify right side
    203.69x = 34,363.11
  5. Step 5: Solve for x
    x = 34,363.11/203.69
  6. Step 6: Final answer
    x = 168.70

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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.