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Finding the Fourth Proportional to 891, 1,331.09 and 745.20

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Solution

The fourth proportional to 891, 1,331.09 and 745.20 is: 1,113.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    891 : 1,331.09 = 745.20 : x
  2. Step 2: Convert to fraction form
    891/1,331.09 = 745.20/x
  3. Step 3: Cross multiply
    891x = 1,331.09 × 745.20
  4. Step 4: Simplify right side
    891x = 991,928.27
  5. Step 5: Solve for x
    x = 991,928.27/891
  6. Step 6: Final answer
    x = 1,113.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.