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Finding the Fourth Proportional to 406.72, 561.22 and 249.43

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Solution

The fourth proportional to 406.72, 561.22 and 249.43 is: 344.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.72 : 561.22 = 249.43 : x
  2. Step 2: Convert to fraction form
    406.72/561.22 = 249.43/x
  3. Step 3: Cross multiply
    406.72x = 561.22 × 249.43
  4. Step 4: Simplify right side
    406.72x = 139,985.10
  5. Step 5: Solve for x
    x = 139,985.10/406.72
  6. Step 6: Final answer
    x = 344.18

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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.