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Finding the Fourth Proportional to 618.90, 854.04 and 353.31

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Solution

The fourth proportional to 618.90, 854.04 and 353.31 is: 487.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.90 : 854.04 = 353.31 : x
  2. Step 2: Convert to fraction form
    618.90/854.04 = 353.31/x
  3. Step 3: Cross multiply
    618.90x = 854.04 × 353.31
  4. Step 4: Simplify right side
    618.90x = 301,740.87
  5. Step 5: Solve for x
    x = 301,740.87/618.90
  6. Step 6: Final answer
    x = 487.54

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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.