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Finding the Fourth Proportional to 494, 681.72 and 287.12

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Solution

The fourth proportional to 494, 681.72 and 287.12 is: 396.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    494 : 681.72 = 287.12 : x
  2. Step 2: Convert to fraction form
    494/681.72 = 287.12/x
  3. Step 3: Cross multiply
    494x = 681.72 × 287.12
  4. Step 4: Simplify right side
    494x = 195,735.45
  5. Step 5: Solve for x
    x = 195,735.45/494
  6. Step 6: Final answer
    x = 396.23

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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.