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Finding the Fourth Proportional to 308, 424.20 and 286.48

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Solution

The fourth proportional to 308, 424.20 and 286.48 is: 394.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    308 : 424.20 = 286.48 : x
  2. Step 2: Convert to fraction form
    308/424.20 = 286.48/x
  3. Step 3: Cross multiply
    308x = 424.20 × 286.48
  4. Step 4: Simplify right side
    308x = 121,524.82
  5. Step 5: Solve for x
    x = 121,524.82/308
  6. Step 6: Final answer
    x = 394.56

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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.