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Finding the Fourth Proportional to 203.72, 305.31 and 117.11

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Solution

The fourth proportional to 203.72, 305.31 and 117.11 is: 175.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.72 : 305.31 = 117.11 : x
  2. Step 2: Convert to fraction form
    203.72/305.31 = 117.11/x
  3. Step 3: Cross multiply
    203.72x = 305.31 × 117.11
  4. Step 4: Simplify right side
    203.72x = 35,754.85
  5. Step 5: Solve for x
    x = 35,754.85/203.72
  6. Step 6: Final answer
    x = 175.51

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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.