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Finding the Fourth Proportional to 486.29, 671.09 and 287.13

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Solution

The fourth proportional to 486.29, 671.09 and 287.13 is: 396.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.29 : 671.09 = 287.13 : x
  2. Step 2: Convert to fraction form
    486.29/671.09 = 287.13/x
  3. Step 3: Cross multiply
    486.29x = 671.09 × 287.13
  4. Step 4: Simplify right side
    486.29x = 192,690.25
  5. Step 5: Solve for x
    x = 192,690.25/486.29
  6. Step 6: Final answer
    x = 396.24

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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.