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Finding the Fourth Proportional to 449.79, 617.39 and 399.57

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Solution

The fourth proportional to 449.79, 617.39 and 399.57 is: 548.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.79 : 617.39 = 399.57 : x
  2. Step 2: Convert to fraction form
    449.79/617.39 = 399.57/x
  3. Step 3: Cross multiply
    449.79x = 617.39 × 399.57
  4. Step 4: Simplify right side
    449.79x = 246,691.52
  5. Step 5: Solve for x
    x = 246,691.52/449.79
  6. Step 6: Final answer
    x = 548.46

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.