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Finding the Fourth Proportional to 618.05, 853.20 and 422.60

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Solution

The fourth proportional to 618.05, 853.20 and 422.60 is: 583.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.05 : 853.20 = 422.60 : x
  2. Step 2: Convert to fraction form
    618.05/853.20 = 422.60/x
  3. Step 3: Cross multiply
    618.05x = 853.20 × 422.60
  4. Step 4: Simplify right side
    618.05x = 360,558.05
  5. Step 5: Solve for x
    x = 360,558.05/618.05
  6. Step 6: Final answer
    x = 583.38

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1.5x scale

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.