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Finding the Fourth Proportional to 308.71, 426.56 and 228.83

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Solution

The fourth proportional to 308.71, 426.56 and 228.83 is: 316.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.71 : 426.56 = 228.83 : x
  2. Step 2: Convert to fraction form
    308.71/426.56 = 228.83/x
  3. Step 3: Cross multiply
    308.71x = 426.56 × 228.83
  4. Step 4: Simplify right side
    308.71x = 97,610.69
  5. Step 5: Solve for x
    x = 97,610.69/308.71
  6. Step 6: Final answer
    x = 316.19

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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.