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Finding the Fourth Proportional to 342.78, 513.03 and 261.16

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Solution

The fourth proportional to 342.78, 513.03 and 261.16 is: 390.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.78 : 513.03 = 261.16 : x
  2. Step 2: Convert to fraction form
    342.78/513.03 = 261.16/x
  3. Step 3: Cross multiply
    342.78x = 513.03 × 261.16
  4. Step 4: Simplify right side
    342.78x = 133,982.91
  5. Step 5: Solve for x
    x = 133,982.91/342.78
  6. Step 6: Final answer
    x = 390.87

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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.