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Finding the Fourth Proportional to 406.80, 561.08 and 273.78

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Solution

The fourth proportional to 406.80, 561.08 and 273.78 is: 377.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.80 : 561.08 = 273.78 : x
  2. Step 2: Convert to fraction form
    406.80/561.08 = 273.78/x
  3. Step 3: Cross multiply
    406.80x = 561.08 × 273.78
  4. Step 4: Simplify right side
    406.80x = 153,612.48
  5. Step 5: Solve for x
    x = 153,612.48/406.80
  6. Step 6: Final answer
    x = 377.61

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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.