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Finding the Fourth Proportional to 204.96, 307.31 and 81.53

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Solution

The fourth proportional to 204.96, 307.31 and 81.53 is: 122.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.96 : 307.31 = 81.53 : x
  2. Step 2: Convert to fraction form
    204.96/307.31 = 81.53/x
  3. Step 3: Cross multiply
    204.96x = 307.31 × 81.53
  4. Step 4: Simplify right side
    204.96x = 25,053.04
  5. Step 5: Solve for x
    x = 25,053.04/204.96
  6. Step 6: Final answer
    x = 122.23

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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.