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Finding the Fourth Proportional to 499.09, 748.78 and 255.79

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Solution

The fourth proportional to 499.09, 748.78 and 255.79 is: 383.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.09 : 748.78 = 255.79 : x
  2. Step 2: Convert to fraction form
    499.09/748.78 = 255.79/x
  3. Step 3: Cross multiply
    499.09x = 748.78 × 255.79
  4. Step 4: Simplify right side
    499.09x = 191,526.69
  5. Step 5: Solve for x
    x = 191,526.69/499.09
  6. Step 6: Final answer
    x = 383.76

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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.