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Finding the Fourth Proportional to 308.71, 425.66 and 286.84

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Solution

The fourth proportional to 308.71, 425.66 and 286.84 is: 395.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.71 : 425.66 = 286.84 : x
  2. Step 2: Convert to fraction form
    308.71/425.66 = 286.84/x
  3. Step 3: Cross multiply
    308.71x = 425.66 × 286.84
  4. Step 4: Simplify right side
    308.71x = 122,096.31
  5. Step 5: Solve for x
    x = 122,096.31/308.71
  6. Step 6: Final answer
    x = 395.50

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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.