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Finding the Fourth Proportional to 911.37, 1,256.94 and 579.22

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Solution

The fourth proportional to 911.37, 1,256.94 and 579.22 is: 798.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.37 : 1,256.94 = 579.22 : x
  2. Step 2: Convert to fraction form
    911.37/1,256.94 = 579.22/x
  3. Step 3: Cross multiply
    911.37x = 1,256.94 × 579.22
  4. Step 4: Simplify right side
    911.37x = 728,048.53
  5. Step 5: Solve for x
    x = 728,048.53/911.37
  6. Step 6: Final answer
    x = 798.85

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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.