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Finding the Fourth Proportional to 203.80, 305.49 and 100.87

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Solution

The fourth proportional to 203.80, 305.49 and 100.87 is: 151.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.80 : 305.49 = 100.87 : x
  2. Step 2: Convert to fraction form
    203.80/305.49 = 100.87/x
  3. Step 3: Cross multiply
    203.80x = 305.49 × 100.87
  4. Step 4: Simplify right side
    203.80x = 30,814.78
  5. Step 5: Solve for x
    x = 30,814.78/203.80
  6. Step 6: Final answer
    x = 151.20

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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.