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Finding the Fourth Proportional to 1,815.20, 2,722.10 and 774.54

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Solution

The fourth proportional to 1,815.20, 2,722.10 and 774.54 is: 1,161.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,815.20 : 2,722.10 = 774.54 : x
  2. Step 2: Convert to fraction form
    1,815.20/2,722.10 = 774.54/x
  3. Step 3: Cross multiply
    1,815.20x = 2,722.10 × 774.54
  4. Step 4: Simplify right side
    1,815.20x = 2,108,375.33
  5. Step 5: Solve for x
    x = 2,108,375.33/1,815.20
  6. Step 6: Final answer
    x = 1,161.51

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1.5x scale

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.