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Finding the Fourth Proportional to 911.10, 1,257.38 and 579.62

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Solution

The fourth proportional to 911.10, 1,257.38 and 579.62 is: 799.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.10 : 1,257.38 = 579.62 : x
  2. Step 2: Convert to fraction form
    911.10/1,257.38 = 579.62/x
  3. Step 3: Cross multiply
    911.10x = 1,257.38 × 579.62
  4. Step 4: Simplify right side
    911.10x = 728,802.60
  5. Step 5: Solve for x
    x = 728,802.60/911.10
  6. Step 6: Final answer
    x = 799.92

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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.