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Finding the Fourth Proportional to 400.77, 600.66 and 279

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Solution

The fourth proportional to 400.77, 600.66 and 279 is: 418.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.77 : 600.66 = 279 : x
  2. Step 2: Convert to fraction form
    400.77/600.66 = 279/x
  3. Step 3: Cross multiply
    400.77x = 600.66 × 279
  4. Step 4: Simplify right side
    400.77x = 167,584.14
  5. Step 5: Solve for x
    x = 167,584.14/400.77
  6. Step 6: Final answer
    x = 418.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.