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Finding the Fourth Proportional to 823.20, 1,136.00 and 450.20

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Solution

The fourth proportional to 823.20, 1,136.00 and 450.20 is: 621.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.20 : 1,136.00 = 450.20 : x
  2. Step 2: Convert to fraction form
    823.20/1,136.00 = 450.20/x
  3. Step 3: Cross multiply
    823.20x = 1,136.00 × 450.20
  4. Step 4: Simplify right side
    823.20x = 511,419.27
  5. Step 5: Solve for x
    x = 511,419.27/823.20
  6. Step 6: Final answer
    x = 621.26

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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.