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Finding the Fourth Proportional to 911.89, 1,258.22 and 580.20

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Solution

The fourth proportional to 911.89, 1,258.22 and 580.20 is: 800.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.89 : 1,258.22 = 580.20 : x
  2. Step 2: Convert to fraction form
    911.89/1,258.22 = 580.20/x
  3. Step 3: Cross multiply
    911.89x = 1,258.22 × 580.20
  4. Step 4: Simplify right side
    911.89x = 730,019.24
  5. Step 5: Solve for x
    x = 730,019.24/911.89
  6. Step 6: Final answer
    x = 800.56

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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.