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Finding the Fourth Proportional to 994.12, 1,372.10 and 580.20

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Solution

The fourth proportional to 994.12, 1,372.10 and 580.20 is: 800.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.12 : 1,372.10 = 580.20 : x
  2. Step 2: Convert to fraction form
    994.12/1,372.10 = 580.20/x
  3. Step 3: Cross multiply
    994.12x = 1,372.10 × 580.20
  4. Step 4: Simplify right side
    994.12x = 796,092.42
  5. Step 5: Solve for x
    x = 796,092.42/994.12
  6. Step 6: Final answer
    x = 800.80

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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.