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Finding the Fourth Proportional to 204.71, 282.55 and 121.87

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Solution

The fourth proportional to 204.71, 282.55 and 121.87 is: 168.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.71 : 282.55 = 121.87 : x
  2. Step 2: Convert to fraction form
    204.71/282.55 = 121.87/x
  3. Step 3: Cross multiply
    204.71x = 282.55 × 121.87
  4. Step 4: Simplify right side
    204.71x = 34,434.19
  5. Step 5: Solve for x
    x = 34,434.19/204.71
  6. Step 6: Final answer
    x = 168.21

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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.