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Finding the Fourth Proportional to 342.38, 513.66 and 261.38

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Solution

The fourth proportional to 342.38, 513.66 and 261.38 is: 392.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.38 : 513.66 = 261.38 : x
  2. Step 2: Convert to fraction form
    342.38/513.66 = 261.38/x
  3. Step 3: Cross multiply
    342.38x = 513.66 × 261.38
  4. Step 4: Simplify right side
    342.38x = 134,260.45
  5. Step 5: Solve for x
    x = 134,260.45/342.38
  6. Step 6: Final answer
    x = 392.14

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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.