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Finding the Fourth Proportional to 812.52, 1,120.50 and 579.24

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Solution

The fourth proportional to 812.52, 1,120.50 and 579.24 is: 798.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.52 : 1,120.50 = 579.24 : x
  2. Step 2: Convert to fraction form
    812.52/1,120.50 = 579.24/x
  3. Step 3: Cross multiply
    812.52x = 1,120.50 × 579.24
  4. Step 4: Simplify right side
    812.52x = 649,038.42
  5. Step 5: Solve for x
    x = 649,038.42/812.52
  6. Step 6: Final answer
    x = 798.80

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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.