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Finding the Fourth Proportional to 331.72, 497.82 and 139.48

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Solution

The fourth proportional to 331.72, 497.82 and 139.48 is: 209.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.72 : 497.82 = 139.48 : x
  2. Step 2: Convert to fraction form
    331.72/497.82 = 139.48/x
  3. Step 3: Cross multiply
    331.72x = 497.82 × 139.48
  4. Step 4: Simplify right side
    331.72x = 69,435.93
  5. Step 5: Solve for x
    x = 69,435.93/331.72
  6. Step 6: Final answer
    x = 209.32

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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.