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Finding the Fourth Proportional to 449.56, 617.07 and 399.32

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Solution

The fourth proportional to 449.56, 617.07 and 399.32 is: 548.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.56 : 617.07 = 399.32 : x
  2. Step 2: Convert to fraction form
    449.56/617.07 = 399.32/x
  3. Step 3: Cross multiply
    449.56x = 617.07 × 399.32
  4. Step 4: Simplify right side
    449.56x = 246,408.39
  5. Step 5: Solve for x
    x = 246,408.39/449.56
  6. Step 6: Final answer
    x = 548.11

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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.