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Finding the Fourth Proportional to 331.85, 497.59 and 136.80

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Solution

The fourth proportional to 331.85, 497.59 and 136.80 is: 205.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.85 : 497.59 = 136.80 : x
  2. Step 2: Convert to fraction form
    331.85/497.59 = 136.80/x
  3. Step 3: Cross multiply
    331.85x = 497.59 × 136.80
  4. Step 4: Simplify right side
    331.85x = 68,070.31
  5. Step 5: Solve for x
    x = 68,070.31/331.85
  6. Step 6: Final answer
    x = 205.12

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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.