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Finding the Fourth Proportional to 519.91, 779.50 and 288.65

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Solution

The fourth proportional to 519.91, 779.50 and 288.65 is: 432.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.91 : 779.50 = 288.65 : x
  2. Step 2: Convert to fraction form
    519.91/779.50 = 288.65/x
  3. Step 3: Cross multiply
    519.91x = 779.50 × 288.65
  4. Step 4: Simplify right side
    519.91x = 225,002.68
  5. Step 5: Solve for x
    x = 225,002.68/519.91
  6. Step 6: Final answer
    x = 432.77

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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.