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Finding the Fourth Proportional to 911.88, 1,258.40 and 518.91

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Solution

The fourth proportional to 911.88, 1,258.40 and 518.91 is: 716.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.88 : 1,258.40 = 518.91 : x
  2. Step 2: Convert to fraction form
    911.88/1,258.40 = 518.91/x
  3. Step 3: Cross multiply
    911.88x = 1,258.40 × 518.91
  4. Step 4: Simplify right side
    911.88x = 652,990.73
  5. Step 5: Solve for x
    x = 652,990.73/911.88
  6. Step 6: Final answer
    x = 716.09

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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.