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Finding the Fourth Proportional to 643.83, 888.17 and 394.73

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Solution

The fourth proportional to 643.83, 888.17 and 394.73 is: 544.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.83 : 888.17 = 394.73 : x
  2. Step 2: Convert to fraction form
    643.83/888.17 = 394.73/x
  3. Step 3: Cross multiply
    643.83x = 888.17 × 394.73
  4. Step 4: Simplify right side
    643.83x = 350,580.93
  5. Step 5: Solve for x
    x = 350,580.93/643.83
  6. Step 6: Final answer
    x = 544.52

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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.