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Finding the Fourth Proportional to 519.52, 780.72 and 518.08

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Solution

The fourth proportional to 519.52, 780.72 and 518.08 is: 778.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.52 : 780.72 = 518.08 : x
  2. Step 2: Convert to fraction form
    519.52/780.72 = 518.08/x
  3. Step 3: Cross multiply
    519.52x = 780.72 × 518.08
  4. Step 4: Simplify right side
    519.52x = 404,475.42
  5. Step 5: Solve for x
    x = 404,475.42/519.52
  6. Step 6: Final answer
    x = 778.56

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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.