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Finding the Fourth Proportional to 406.96, 561.63 and 319.48

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Solution

The fourth proportional to 406.96, 561.63 and 319.48 is: 440.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.96 : 561.63 = 319.48 : x
  2. Step 2: Convert to fraction form
    406.96/561.63 = 319.48/x
  3. Step 3: Cross multiply
    406.96x = 561.63 × 319.48
  4. Step 4: Simplify right side
    406.96x = 179,429.55
  5. Step 5: Solve for x
    x = 179,429.55/406.96
  6. Step 6: Final answer
    x = 440.90

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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.