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Finding the Fourth Proportional to 204.81, 282.58 and 121.88

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Solution

The fourth proportional to 204.81, 282.58 and 121.88 is: 168.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.81 : 282.58 = 121.88 : x
  2. Step 2: Convert to fraction form
    204.81/282.58 = 121.88/x
  3. Step 3: Cross multiply
    204.81x = 282.58 × 121.88
  4. Step 4: Simplify right side
    204.81x = 34,440.30
  5. Step 5: Solve for x
    x = 34,440.30/204.81
  6. Step 6: Final answer
    x = 168.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.