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Finding the Fourth Proportional to 618.50, 854.10 and 397.83

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Solution

The fourth proportional to 618.50, 854.10 and 397.83 is: 549.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.50 : 854.10 = 397.83 : x
  2. Step 2: Convert to fraction form
    618.50/854.10 = 397.83/x
  3. Step 3: Cross multiply
    618.50x = 854.10 × 397.83
  4. Step 4: Simplify right side
    618.50x = 339,786.60
  5. Step 5: Solve for x
    x = 339,786.60/618.50
  6. Step 6: Final answer
    x = 549.37

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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.