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Finding the Fourth Proportional to 496.87, 685.80 and 287.16

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Solution

The fourth proportional to 496.87, 685.80 and 287.16 is: 396.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    496.87 : 685.80 = 287.16 : x
  2. Step 2: Convert to fraction form
    496.87/685.80 = 287.16/x
  3. Step 3: Cross multiply
    496.87x = 685.80 × 287.16
  4. Step 4: Simplify right side
    496.87x = 196,935.08
  5. Step 5: Solve for x
    x = 196,935.08/496.87
  6. Step 6: Final answer
    x = 396.35

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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.