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Finding the Fourth Proportional to 308.90, 426.20 and 177.98

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Solution

The fourth proportional to 308.90, 426.20 and 177.98 is: 245.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.90 : 426.20 = 177.98 : x
  2. Step 2: Convert to fraction form
    308.90/426.20 = 177.98/x
  3. Step 3: Cross multiply
    308.90x = 426.20 × 177.98
  4. Step 4: Simplify right side
    308.90x = 75,855.08
  5. Step 5: Solve for x
    x = 75,855.08/308.90
  6. Step 6: Final answer
    x = 245.57

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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.