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Finding the Fourth Proportional to 911.90, 1,258.49 and 580.34

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Solution

The fourth proportional to 911.90, 1,258.49 and 580.34 is: 800.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.90 : 1,258.49 = 580.34 : x
  2. Step 2: Convert to fraction form
    911.90/1,258.49 = 580.34/x
  3. Step 3: Cross multiply
    911.90x = 1,258.49 × 580.34
  4. Step 4: Simplify right side
    911.90x = 730,352.09
  5. Step 5: Solve for x
    x = 730,352.09/911.90
  6. Step 6: Final answer
    x = 800.91

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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.