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Finding the Fourth Proportional to 206.07, 308.70 and 119.15

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Solution

The fourth proportional to 206.07, 308.70 and 119.15 is: 178.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.07 : 308.70 = 119.15 : x
  2. Step 2: Convert to fraction form
    206.07/308.70 = 119.15/x
  3. Step 3: Cross multiply
    206.07x = 308.70 × 119.15
  4. Step 4: Simplify right side
    206.07x = 36,781.61
  5. Step 5: Solve for x
    x = 36,781.61/206.07
  6. Step 6: Final answer
    x = 178.49

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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.