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Finding the Fourth Proportional to 772.80, 1,161.90 and 756.60

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Solution

The fourth proportional to 772.80, 1,161.90 and 756.60 is: 1,137.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.80 : 1,161.90 = 756.60 : x
  2. Step 2: Convert to fraction form
    772.80/1,161.90 = 756.60/x
  3. Step 3: Cross multiply
    772.80x = 1,161.90 × 756.60
  4. Step 4: Simplify right side
    772.80x = 879,093.54
  5. Step 5: Solve for x
    x = 879,093.54/772.80
  6. Step 6: Final answer
    x = 1,137.54

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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.