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Finding the Fourth Proportional to 203.38, 305.08 and 81.63

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Solution

The fourth proportional to 203.38, 305.08 and 81.63 is: 122.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.38 : 305.08 = 81.63 : x
  2. Step 2: Convert to fraction form
    203.38/305.08 = 81.63/x
  3. Step 3: Cross multiply
    203.38x = 305.08 × 81.63
  4. Step 4: Simplify right side
    203.38x = 24,904.45
  5. Step 5: Solve for x
    x = 24,904.45/203.38
  6. Step 6: Final answer
    x = 122.45

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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.