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Finding the Fourth Proportional to 348.78, 481.35 and 261.30

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Solution

The fourth proportional to 348.78, 481.35 and 261.30 is: 360.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.78 : 481.35 = 261.30 : x
  2. Step 2: Convert to fraction form
    348.78/481.35 = 261.30/x
  3. Step 3: Cross multiply
    348.78x = 481.35 × 261.30
  4. Step 4: Simplify right side
    348.78x = 125,776.76
  5. Step 5: Solve for x
    x = 125,776.76/348.78
  6. Step 6: Final answer
    x = 360.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.