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Finding the Fourth Proportional to 336.78, 505.20 and 131.34

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Solution

The fourth proportional to 336.78, 505.20 and 131.34 is: 197.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    336.78 : 505.20 = 131.34 : x
  2. Step 2: Convert to fraction form
    336.78/505.20 = 131.34/x
  3. Step 3: Cross multiply
    336.78x = 505.20 × 131.34
  4. Step 4: Simplify right side
    336.78x = 66,352.97
  5. Step 5: Solve for x
    x = 66,352.97/336.78
  6. Step 6: Final answer
    x = 197.02

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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.