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Finding the Fourth Proportional to 203.88, 305.72 and 66.91

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Solution

The fourth proportional to 203.88, 305.72 and 66.91 is: 100.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.88 : 305.72 = 66.91 : x
  2. Step 2: Convert to fraction form
    203.88/305.72 = 66.91/x
  3. Step 3: Cross multiply
    203.88x = 305.72 × 66.91
  4. Step 4: Simplify right side
    203.88x = 20,453.86
  5. Step 5: Solve for x
    x = 20,453.86/203.88
  6. Step 6: Final answer
    x = 100.32

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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.