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Finding the Fourth Proportional to 203.78, 305.73 and 73.78

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Solution

The fourth proportional to 203.78, 305.73 and 73.78 is: 110.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.78 : 305.73 = 73.78 : x
  2. Step 2: Convert to fraction form
    203.78/305.73 = 73.78/x
  3. Step 3: Cross multiply
    203.78x = 305.73 × 73.78
  4. Step 4: Simplify right side
    203.78x = 22,556.76
  5. Step 5: Solve for x
    x = 22,556.76/203.78
  6. Step 6: Final answer
    x = 110.69

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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.