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Finding the Fourth Proportional to 204.34, 281.90 and 129.65

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Solution

The fourth proportional to 204.34, 281.90 and 129.65 is: 178.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.34 : 281.90 = 129.65 : x
  2. Step 2: Convert to fraction form
    204.34/281.90 = 129.65/x
  3. Step 3: Cross multiply
    204.34x = 281.90 × 129.65
  4. Step 4: Simplify right side
    204.34x = 36,547.25
  5. Step 5: Solve for x
    x = 36,547.25/204.34
  6. Step 6: Final answer
    x = 178.86

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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.