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Finding the Fourth Proportional to 331.83, 498.11 and 139.59

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Solution

The fourth proportional to 331.83, 498.11 and 139.59 is: 209.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.83 : 498.11 = 139.59 : x
  2. Step 2: Convert to fraction form
    331.83/498.11 = 139.59/x
  3. Step 3: Cross multiply
    331.83x = 498.11 × 139.59
  4. Step 4: Simplify right side
    331.83x = 69,530.48
  5. Step 5: Solve for x
    x = 69,530.48/331.83
  6. Step 6: Final answer
    x = 209.54

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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.