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Finding the Fourth Proportional to 911.10, 1,257.07 and 579.86

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Solution

The fourth proportional to 911.10, 1,257.07 and 579.86 is: 800.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.10 : 1,257.07 = 579.86 : x
  2. Step 2: Convert to fraction form
    911.10/1,257.07 = 579.86/x
  3. Step 3: Cross multiply
    911.10x = 1,257.07 × 579.86
  4. Step 4: Simplify right side
    911.10x = 728,922.68
  5. Step 5: Solve for x
    x = 728,922.68/911.10
  6. Step 6: Final answer
    x = 800.05

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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.