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Finding the Fourth Proportional to 911.34, 1,257.39 and 579.96

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Solution

The fourth proportional to 911.34, 1,257.39 and 579.96 is: 800.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.34 : 1,257.39 = 579.96 : x
  2. Step 2: Convert to fraction form
    911.34/1,257.39 = 579.96/x
  3. Step 3: Cross multiply
    911.34x = 1,257.39 × 579.96
  4. Step 4: Simplify right side
    911.34x = 729,235.90
  5. Step 5: Solve for x
    x = 729,235.90/911.34
  6. Step 6: Final answer
    x = 800.18

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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.