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Finding the Fourth Proportional to 342.18, 512.79 and 211.74

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Solution

The fourth proportional to 342.18, 512.79 and 211.74 is: 317.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.18 : 512.79 = 211.74 : x
  2. Step 2: Convert to fraction form
    342.18/512.79 = 211.74/x
  3. Step 3: Cross multiply
    342.18x = 512.79 × 211.74
  4. Step 4: Simplify right side
    342.18x = 108,578.15
  5. Step 5: Solve for x
    x = 108,578.15/342.18
  6. Step 6: Final answer
    x = 317.31

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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.