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Finding the Fourth Proportional to 855.73, 1,282.34 and 392.37

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Solution

The fourth proportional to 855.73, 1,282.34 and 392.37 is: 587.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.73 : 1,282.34 = 392.37 : x
  2. Step 2: Convert to fraction form
    855.73/1,282.34 = 392.37/x
  3. Step 3: Cross multiply
    855.73x = 1,282.34 × 392.37
  4. Step 4: Simplify right side
    855.73x = 503,143.37
  5. Step 5: Solve for x
    x = 503,143.37/855.73
  6. Step 6: Final answer
    x = 587.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.