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Finding the Fourth Proportional to 206.96, 308.51 and 178.20

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Solution

The fourth proportional to 206.96, 308.51 and 178.20 is: 265.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.96 : 308.51 = 178.20 : x
  2. Step 2: Convert to fraction form
    206.96/308.51 = 178.20/x
  3. Step 3: Cross multiply
    206.96x = 308.51 × 178.20
  4. Step 4: Simplify right side
    206.96x = 54,976.26
  5. Step 5: Solve for x
    x = 54,976.26/206.96
  6. Step 6: Final answer
    x = 265.64

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.