Home / 1,917.87-2,874.40-820.95

Finding the Fourth Proportional to 1,917.87, 2,874.40 and 820.95

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Solution

The fourth proportional to 1,917.87, 2,874.40 and 820.95 is: 1,230.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,917.87 : 2,874.40 = 820.95 : x
  2. Step 2: Convert to fraction form
    1,917.87/2,874.40 = 820.95/x
  3. Step 3: Cross multiply
    1,917.87x = 2,874.40 × 820.95
  4. Step 4: Simplify right side
    1,917.87x = 2,359,724.31
  5. Step 5: Solve for x
    x = 2,359,724.31/1,917.87
  6. Step 6: Final answer
    x = 1,230.39

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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.