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Finding the Fourth Proportional to 202.98, 304.59 and 81.21

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Solution

The fourth proportional to 202.98, 304.59 and 81.21 is: 121.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.98 : 304.59 = 81.21 : x
  2. Step 2: Convert to fraction form
    202.98/304.59 = 81.21/x
  3. Step 3: Cross multiply
    202.98x = 304.59 × 81.21
  4. Step 4: Simplify right side
    202.98x = 24,735.75
  5. Step 5: Solve for x
    x = 24,735.75/202.98
  6. Step 6: Final answer
    x = 121.86

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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.