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Finding the Fourth Proportional to 519.61, 779.75 and 276.30

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Solution

The fourth proportional to 519.61, 779.75 and 276.30 is: 414.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.61 : 779.75 = 276.30 : x
  2. Step 2: Convert to fraction form
    519.61/779.75 = 276.30/x
  3. Step 3: Cross multiply
    519.61x = 779.75 × 276.30
  4. Step 4: Simplify right side
    519.61x = 215,446.76
  5. Step 5: Solve for x
    x = 215,446.76/519.61
  6. Step 6: Final answer
    x = 414.63

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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.