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Finding the Fourth Proportional to 812.88, 1,120.68 and 579.60

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Solution

The fourth proportional to 812.88, 1,120.68 and 579.60 is: 799.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.88 : 1,120.68 = 579.60 : x
  2. Step 2: Convert to fraction form
    812.88/1,120.68 = 579.60/x
  3. Step 3: Cross multiply
    812.88x = 1,120.68 × 579.60
  4. Step 4: Simplify right side
    812.88x = 649,546.13
  5. Step 5: Solve for x
    x = 649,546.13/812.88
  6. Step 6: Final answer
    x = 799.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.