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Finding the Fourth Proportional to 397.72, 548.69 and 286.95

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Solution

The fourth proportional to 397.72, 548.69 and 286.95 is: 395.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.72 : 548.69 = 286.95 : x
  2. Step 2: Convert to fraction form
    397.72/548.69 = 286.95/x
  3. Step 3: Cross multiply
    397.72x = 548.69 × 286.95
  4. Step 4: Simplify right side
    397.72x = 157,449.37
  5. Step 5: Solve for x
    x = 157,449.37/397.72
  6. Step 6: Final answer
    x = 395.88

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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.