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Finding the Fourth Proportional to 792.72, 1,190.70 and 519.21

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Solution

The fourth proportional to 792.72, 1,190.70 and 519.21 is: 779.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.72 : 1,190.70 = 519.21 : x
  2. Step 2: Convert to fraction form
    792.72/1,190.70 = 519.21/x
  3. Step 3: Cross multiply
    792.72x = 1,190.70 × 519.21
  4. Step 4: Simplify right side
    792.72x = 618,223.35
  5. Step 5: Solve for x
    x = 618,223.35/792.72
  6. Step 6: Final answer
    x = 779.88

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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.