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Finding the Fourth Proportional to 308.74, 426.09 and 177.76

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Solution

The fourth proportional to 308.74, 426.09 and 177.76 is: 245.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.74 : 426.09 = 177.76 : x
  2. Step 2: Convert to fraction form
    308.74/426.09 = 177.76/x
  3. Step 3: Cross multiply
    308.74x = 426.09 × 177.76
  4. Step 4: Simplify right side
    308.74x = 75,741.76
  5. Step 5: Solve for x
    x = 75,741.76/308.74
  6. Step 6: Final answer
    x = 245.33

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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.