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Finding the Fourth Proportional to 618.56, 853.71 and 422.12

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Solution

The fourth proportional to 618.56, 853.71 and 422.12 is: 582.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.56 : 853.71 = 422.12 : x
  2. Step 2: Convert to fraction form
    618.56/853.71 = 422.12/x
  3. Step 3: Cross multiply
    618.56x = 853.71 × 422.12
  4. Step 4: Simplify right side
    618.56x = 360,368.07
  5. Step 5: Solve for x
    x = 360,368.07/618.56
  6. Step 6: Final answer
    x = 582.59

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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.