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Finding the Fourth Proportional to 342.27, 513.03 and 136.78

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Solution

The fourth proportional to 342.27, 513.03 and 136.78 is: 205.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.27 : 513.03 = 136.78 : x
  2. Step 2: Convert to fraction form
    342.27/513.03 = 136.78/x
  3. Step 3: Cross multiply
    342.27x = 513.03 × 136.78
  4. Step 4: Simplify right side
    342.27x = 70,172.24
  5. Step 5: Solve for x
    x = 70,172.24/342.27
  6. Step 6: Final answer
    x = 205.02

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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.