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Finding the Fourth Proportional to 911.01, 1,256.88 and 745.17

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Solution

The fourth proportional to 911.01, 1,256.88 and 745.17 is: 1,028.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.01 : 1,256.88 = 745.17 : x
  2. Step 2: Convert to fraction form
    911.01/1,256.88 = 745.17/x
  3. Step 3: Cross multiply
    911.01x = 1,256.88 × 745.17
  4. Step 4: Simplify right side
    911.01x = 936,589.27
  5. Step 5: Solve for x
    x = 936,589.27/911.01
  6. Step 6: Final answer
    x = 1,028.08

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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.