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Finding the Fourth Proportional to 203.21, 304.82 and 66.20

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Solution

The fourth proportional to 203.21, 304.82 and 66.20 is: 99.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.21 : 304.82 = 66.20 : x
  2. Step 2: Convert to fraction form
    203.21/304.82 = 66.20/x
  3. Step 3: Cross multiply
    203.21x = 304.82 × 66.20
  4. Step 4: Simplify right side
    203.21x = 20,177.56
  5. Step 5: Solve for x
    x = 20,177.56/203.21
  6. Step 6: Final answer
    x = 99.30

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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.