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Finding the Fourth Proportional to 618.46, 853.31 and 419.39

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Solution

The fourth proportional to 618.46, 853.31 and 419.39 is: 578.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.46 : 853.31 = 419.39 : x
  2. Step 2: Convert to fraction form
    618.46/853.31 = 419.39/x
  3. Step 3: Cross multiply
    618.46x = 853.31 × 419.39
  4. Step 4: Simplify right side
    618.46x = 357,869.68
  5. Step 5: Solve for x
    x = 357,869.68/618.46
  6. Step 6: Final answer
    x = 578.65

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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.