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Finding the Fourth Proportional to 618.96, 854.75 and 398.30

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Solution

The fourth proportional to 618.96, 854.75 and 398.30 is: 550.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.96 : 854.75 = 398.30 : x
  2. Step 2: Convert to fraction form
    618.96/854.75 = 398.30/x
  3. Step 3: Cross multiply
    618.96x = 854.75 × 398.30
  4. Step 4: Simplify right side
    618.96x = 340,446.21
  5. Step 5: Solve for x
    x = 340,446.21/618.96
  6. Step 6: Final answer
    x = 550.03

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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.