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Finding the Fourth Proportional to 331.80, 497.62 and 139.24

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Solution

The fourth proportional to 331.80, 497.62 and 139.24 is: 208.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.80 : 497.62 = 139.24 : x
  2. Step 2: Convert to fraction form
    331.80/497.62 = 139.24/x
  3. Step 3: Cross multiply
    331.80x = 497.62 × 139.24
  4. Step 4: Simplify right side
    331.80x = 69,288.61
  5. Step 5: Solve for x
    x = 69,288.61/331.80
  6. Step 6: Final answer
    x = 208.83

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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.