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Finding the Fourth Proportional to 605.15, 908.18 and 399.64

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Solution

The fourth proportional to 605.15, 908.18 and 399.64 is: 599.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    605.15 : 908.18 = 399.64 : x
  2. Step 2: Convert to fraction form
    605.15/908.18 = 399.64/x
  3. Step 3: Cross multiply
    605.15x = 908.18 × 399.64
  4. Step 4: Simplify right side
    605.15x = 362,945.06
  5. Step 5: Solve for x
    x = 362,945.06/605.15
  6. Step 6: Final answer
    x = 599.76

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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.