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Finding the Fourth Proportional to 204.64, 305.12 and 198.72

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Solution

The fourth proportional to 204.64, 305.12 and 198.72 is: 296.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.64 : 305.12 = 198.72 : x
  2. Step 2: Convert to fraction form
    204.64/305.12 = 198.72/x
  3. Step 3: Cross multiply
    204.64x = 305.12 × 198.72
  4. Step 4: Simplify right side
    204.64x = 60,633.45
  5. Step 5: Solve for x
    x = 60,633.45/204.64
  6. Step 6: Final answer
    x = 296.29

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.