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Finding the Fourth Proportional to 206.04, 309.69 and 129.15

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Solution

The fourth proportional to 206.04, 309.69 and 129.15 is: 194.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.04 : 309.69 = 129.15 : x
  2. Step 2: Convert to fraction form
    206.04/309.69 = 129.15/x
  3. Step 3: Cross multiply
    206.04x = 309.69 × 129.15
  4. Step 4: Simplify right side
    206.04x = 39,996.46
  5. Step 5: Solve for x
    x = 39,996.46/206.04
  6. Step 6: Final answer
    x = 194.12

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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.