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Finding the Fourth Proportional to 204.89, 307.85 and 131.81

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Solution

The fourth proportional to 204.89, 307.85 and 131.81 is: 198.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.89 : 307.85 = 131.81 : x
  2. Step 2: Convert to fraction form
    204.89/307.85 = 131.81/x
  3. Step 3: Cross multiply
    204.89x = 307.85 × 131.81
  4. Step 4: Simplify right side
    204.89x = 40,575.51
  5. Step 5: Solve for x
    x = 40,575.51/204.89
  6. Step 6: Final answer
    x = 198.04

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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.