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Finding the Fourth Proportional to 855.38, 1,283.55 and 422.54

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Solution

The fourth proportional to 855.38, 1,283.55 and 422.54 is: 634.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.38 : 1,283.55 = 422.54 : x
  2. Step 2: Convert to fraction form
    855.38/1,283.55 = 422.54/x
  3. Step 3: Cross multiply
    855.38x = 1,283.55 × 422.54
  4. Step 4: Simplify right side
    855.38x = 542,351.22
  5. Step 5: Solve for x
    x = 542,351.22/855.38
  6. Step 6: Final answer
    x = 634.05

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Double scale
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1.5x scale

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.