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Finding the Fourth Proportional to 342.12, 512.97 and 136.65

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Solution

The fourth proportional to 342.12, 512.97 and 136.65 is: 204.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.12 : 512.97 = 136.65 : x
  2. Step 2: Convert to fraction form
    342.12/512.97 = 136.65/x
  3. Step 3: Cross multiply
    342.12x = 512.97 × 136.65
  4. Step 4: Simplify right side
    342.12x = 70,097.35
  5. Step 5: Solve for x
    x = 70,097.35/342.12
  6. Step 6: Final answer
    x = 204.89

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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.