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Finding the Fourth Proportional to 891.36, 1,336.20 and 755.28

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Solution

The fourth proportional to 891.36, 1,336.20 and 755.28 is: 1,132.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.36 : 1,336.20 = 755.28 : x
  2. Step 2: Convert to fraction form
    891.36/1,336.20 = 755.28/x
  3. Step 3: Cross multiply
    891.36x = 1,336.20 × 755.28
  4. Step 4: Simplify right side
    891.36x = 1,009,205.14
  5. Step 5: Solve for x
    x = 1,009,205.14/891.36
  6. Step 6: Final answer
    x = 1,132.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.