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Finding the Fourth Proportional to 643.53, 888.02 and 394.82

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Solution

The fourth proportional to 643.53, 888.02 and 394.82 is: 544.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.53 : 888.02 = 394.82 : x
  2. Step 2: Convert to fraction form
    643.53/888.02 = 394.82/x
  3. Step 3: Cross multiply
    643.53x = 888.02 × 394.82
  4. Step 4: Simplify right side
    643.53x = 350,601.64
  5. Step 5: Solve for x
    x = 350,601.64/643.53
  6. Step 6: Final answer
    x = 544.81

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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.