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Finding the Fourth Proportional to 539.99, 809.07 and 519.74

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Solution

The fourth proportional to 539.99, 809.07 and 519.74 is: 778.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.99 : 809.07 = 519.74 : x
  2. Step 2: Convert to fraction form
    539.99/809.07 = 519.74/x
  3. Step 3: Cross multiply
    539.99x = 809.07 × 519.74
  4. Step 4: Simplify right side
    539.99x = 420,502.00
  5. Step 5: Solve for x
    x = 420,502.00/539.99
  6. Step 6: Final answer
    x = 778.73

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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.