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Finding the Fourth Proportional to 486.44, 671.28 and 287.22

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Solution

The fourth proportional to 486.44, 671.28 and 287.22 is: 396.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.44 : 671.28 = 287.22 : x
  2. Step 2: Convert to fraction form
    486.44/671.28 = 287.22/x
  3. Step 3: Cross multiply
    486.44x = 671.28 × 287.22
  4. Step 4: Simplify right side
    486.44x = 192,805.04
  5. Step 5: Solve for x
    x = 192,805.04/486.44
  6. Step 6: Final answer
    x = 396.36

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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.