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Finding the Fourth Proportional to 812.42, 1,120.60 and 518.05

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Solution

The fourth proportional to 812.42, 1,120.60 and 518.05 is: 714.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.42 : 1,120.60 = 518.05 : x
  2. Step 2: Convert to fraction form
    812.42/1,120.60 = 518.05/x
  3. Step 3: Cross multiply
    812.42x = 1,120.60 × 518.05
  4. Step 4: Simplify right side
    812.42x = 580,526.83
  5. Step 5: Solve for x
    x = 580,526.83/812.42
  6. Step 6: Final answer
    x = 714.56

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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.