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Finding the Fourth Proportional to 203.68, 305.12 and 107.68

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Solution

The fourth proportional to 203.68, 305.12 and 107.68 is: 161.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.68 : 305.12 = 107.68 : x
  2. Step 2: Convert to fraction form
    203.68/305.12 = 107.68/x
  3. Step 3: Cross multiply
    203.68x = 305.12 × 107.68
  4. Step 4: Simplify right side
    203.68x = 32,855.32
  5. Step 5: Solve for x
    x = 32,855.32/203.68
  6. Step 6: Final answer
    x = 161.31

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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.