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Finding the Fourth Proportional to 499.58, 748.79 and 239.21

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Solution

The fourth proportional to 499.58, 748.79 and 239.21 is: 358.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.58 : 748.79 = 239.21 : x
  2. Step 2: Convert to fraction form
    499.58/748.79 = 239.21/x
  3. Step 3: Cross multiply
    499.58x = 748.79 × 239.21
  4. Step 4: Simplify right side
    499.58x = 179,118.06
  5. Step 5: Solve for x
    x = 179,118.06/499.58
  6. Step 6: Final answer
    x = 358.54

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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.