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Finding the Fourth Proportional to 406.68, 561.11 and 240.78

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Solution

The fourth proportional to 406.68, 561.11 and 240.78 is: 332.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.68 : 561.11 = 240.78 : x
  2. Step 2: Convert to fraction form
    406.68/561.11 = 240.78/x
  3. Step 3: Cross multiply
    406.68x = 561.11 × 240.78
  4. Step 4: Simplify right side
    406.68x = 135,104.07
  5. Step 5: Solve for x
    x = 135,104.07/406.68
  6. Step 6: Final answer
    x = 332.21

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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.