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Finding the Fourth Proportional to 331.41, 497.11 and 139.04

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Solution

The fourth proportional to 331.41, 497.11 and 139.04 is: 208.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.41 : 497.11 = 139.04 : x
  2. Step 2: Convert to fraction form
    331.41/497.11 = 139.04/x
  3. Step 3: Cross multiply
    331.41x = 497.11 × 139.04
  4. Step 4: Simplify right side
    331.41x = 69,115.34
  5. Step 5: Solve for x
    x = 69,115.34/331.41
  6. Step 6: Final answer
    x = 208.55

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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.