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Finding the Fourth Proportional to 336.81, 505.20 and 131.42

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Solution

The fourth proportional to 336.81, 505.20 and 131.42 is: 197.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    336.81 : 505.20 = 131.42 : x
  2. Step 2: Convert to fraction form
    336.81/505.20 = 131.42/x
  3. Step 3: Cross multiply
    336.81x = 505.20 × 131.42
  4. Step 4: Simplify right side
    336.81x = 66,393.01
  5. Step 5: Solve for x
    x = 66,393.01/336.81
  6. Step 6: Final answer
    x = 197.12

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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.