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Finding the Fourth Proportional to 911.56, 1,257.20 and 579.41

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Solution

The fourth proportional to 911.56, 1,257.20 and 579.41 is: 799.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.56 : 1,257.20 = 579.41 : x
  2. Step 2: Convert to fraction form
    911.56/1,257.20 = 579.41/x
  3. Step 3: Cross multiply
    911.56x = 1,257.20 × 579.41
  4. Step 4: Simplify right side
    911.56x = 728,435.22
  5. Step 5: Solve for x
    x = 728,435.22/911.56
  6. Step 6: Final answer
    x = 799.11

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Double scale
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1.5x scale

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.