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Finding the Fourth Proportional to 204.85, 282.65 and 121.90

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Solution

The fourth proportional to 204.85, 282.65 and 121.90 is: 168.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.85 : 282.65 = 121.90 : x
  2. Step 2: Convert to fraction form
    204.85/282.65 = 121.90/x
  3. Step 3: Cross multiply
    204.85x = 282.65 × 121.90
  4. Step 4: Simplify right side
    204.85x = 34,455.24
  5. Step 5: Solve for x
    x = 34,455.24/204.85
  6. Step 6: Final answer
    x = 168.20

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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.