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Finding the Fourth Proportional to 2,765.16, 3,813.21 and 1,821.51

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Solution

The fourth proportional to 2,765.16, 3,813.21 and 1,821.51 is: 2,511.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,765.16 : 3,813.21 = 1,821.51 : x
  2. Step 2: Convert to fraction form
    2,765.16/3,813.21 = 1,821.51/x
  3. Step 3: Cross multiply
    2,765.16x = 3,813.21 × 1,821.51
  4. Step 4: Simplify right side
    2,765.16x = 6,945,800.15
  5. Step 5: Solve for x
    x = 6,945,800.15/2,765.16
  6. Step 6: Final answer
    x = 2,511.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.