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Finding the Fourth Proportional to 342.12, 513.42 and 136.74

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Solution

The fourth proportional to 342.12, 513.42 and 136.74 is: 205.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.12 : 513.42 = 136.74 : x
  2. Step 2: Convert to fraction form
    342.12/513.42 = 136.74/x
  3. Step 3: Cross multiply
    342.12x = 513.42 × 136.74
  4. Step 4: Simplify right side
    342.12x = 70,207.62
  5. Step 5: Solve for x
    x = 70,207.62/342.12
  6. Step 6: Final answer
    x = 205.21

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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.