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Finding the Fourth Proportional to 397.80, 548.67 and 287.46

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Solution

The fourth proportional to 397.80, 548.67 and 287.46 is: 396.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.80 : 548.67 = 287.46 : x
  2. Step 2: Convert to fraction form
    397.80/548.67 = 287.46/x
  3. Step 3: Cross multiply
    397.80x = 548.67 × 287.46
  4. Step 4: Simplify right side
    397.80x = 157,720.68
  5. Step 5: Solve for x
    x = 157,720.68/397.80
  6. Step 6: Final answer
    x = 396.48

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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.