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Finding the Fourth Proportional to 342.69, 513.92 and 137.28

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Solution

The fourth proportional to 342.69, 513.92 and 137.28 is: 205.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.69 : 513.92 = 137.28 : x
  2. Step 2: Convert to fraction form
    342.69/513.92 = 137.28/x
  3. Step 3: Cross multiply
    342.69x = 513.92 × 137.28
  4. Step 4: Simplify right side
    342.69x = 70,550.25
  5. Step 5: Solve for x
    x = 70,550.25/342.69
  6. Step 6: Final answer
    x = 205.87

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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.