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Finding the Fourth Proportional to 342.92, 513.98 and 261.80

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Solution

The fourth proportional to 342.92, 513.98 and 261.80 is: 392.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.92 : 513.98 = 261.80 : x
  2. Step 2: Convert to fraction form
    342.92/513.98 = 261.80/x
  3. Step 3: Cross multiply
    342.92x = 513.98 × 261.80
  4. Step 4: Simplify right side
    342.92x = 134,559.96
  5. Step 5: Solve for x
    x = 134,559.96/342.92
  6. Step 6: Final answer
    x = 392.39

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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.