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Finding the Fourth Proportional to 1,815.09, 2,722.64 and 774.90

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Solution

The fourth proportional to 1,815.09, 2,722.64 and 774.90 is: 1,162.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,815.09 : 2,722.64 = 774.90 : x
  2. Step 2: Convert to fraction form
    1,815.09/2,722.64 = 774.90/x
  3. Step 3: Cross multiply
    1,815.09x = 2,722.64 × 774.90
  4. Step 4: Simplify right side
    1,815.09x = 2,109,759.65
  5. Step 5: Solve for x
    x = 2,109,759.65/1,815.09
  6. Step 6: Final answer
    x = 1,162.35

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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.