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Finding the Fourth Proportional to 342.11, 513.39 and 122.81

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Solution

The fourth proportional to 342.11, 513.39 and 122.81 is: 184.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.11 : 513.39 = 122.81 : x
  2. Step 2: Convert to fraction form
    342.11/513.39 = 122.81/x
  3. Step 3: Cross multiply
    342.11x = 513.39 × 122.81
  4. Step 4: Simplify right side
    342.11x = 63,046.86
  5. Step 5: Solve for x
    x = 63,046.86/342.11
  6. Step 6: Final answer
    x = 184.29

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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.