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Finding the Fourth Proportional to 855.57, 1,283.64 and 422.43

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Solution

The fourth proportional to 855.57, 1,283.64 and 422.43 is: 633.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.57 : 1,283.64 = 422.43 : x
  2. Step 2: Convert to fraction form
    855.57/1,283.64 = 422.43/x
  3. Step 3: Cross multiply
    855.57x = 1,283.64 × 422.43
  4. Step 4: Simplify right side
    855.57x = 542,248.05
  5. Step 5: Solve for x
    x = 542,248.05/855.57
  6. Step 6: Final answer
    x = 633.79

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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.