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Finding the Fourth Proportional to 772.20, 1,157.90 and 224.24

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Solution

The fourth proportional to 772.20, 1,157.90 and 224.24 is: 336.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.20 : 1,157.90 = 224.24 : x
  2. Step 2: Convert to fraction form
    772.20/1,157.90 = 224.24/x
  3. Step 3: Cross multiply
    772.20x = 1,157.90 × 224.24
  4. Step 4: Simplify right side
    772.20x = 259,640.59
  5. Step 5: Solve for x
    x = 259,640.59/772.20
  6. Step 6: Final answer
    x = 336.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.