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Finding the Fourth Proportional to 855.87, 1,283.75 and 422.88

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Solution

The fourth proportional to 855.87, 1,283.75 and 422.88 is: 634.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.87 : 1,283.75 = 422.88 : x
  2. Step 2: Convert to fraction form
    855.87/1,283.75 = 422.88/x
  3. Step 3: Cross multiply
    855.87x = 1,283.75 × 422.88
  4. Step 4: Simplify right side
    855.87x = 542,865.78
  5. Step 5: Solve for x
    x = 542,865.78/855.87
  6. Step 6: Final answer
    x = 634.29

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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.