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Finding the Fourth Proportional to 203.11, 304.79 and 85.98

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Solution

The fourth proportional to 203.11, 304.79 and 85.98 is: 129.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.11 : 304.79 = 85.98 : x
  2. Step 2: Convert to fraction form
    203.11/304.79 = 85.98/x
  3. Step 3: Cross multiply
    203.11x = 304.79 × 85.98
  4. Step 4: Simplify right side
    203.11x = 26,203.89
  5. Step 5: Solve for x
    x = 26,203.89/203.11
  6. Step 6: Final answer
    x = 129.01

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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.