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Finding the Fourth Proportional to 618.30, 927.45 and 399.60

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Solution

The fourth proportional to 618.30, 927.45 and 399.60 is: 599.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.30 : 927.45 = 399.60 : x
  2. Step 2: Convert to fraction form
    618.30/927.45 = 399.60/x
  3. Step 3: Cross multiply
    618.30x = 927.45 × 399.60
  4. Step 4: Simplify right side
    618.30x = 370,609.02
  5. Step 5: Solve for x
    x = 370,609.02/618.30
  6. Step 6: Final answer
    x = 599.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.