Home / 2,815.84-3,887.20-2,155.44

Finding the Fourth Proportional to 2,815.84, 3,887.20 and 2,155.44

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Solution

The fourth proportional to 2,815.84, 3,887.20 and 2,155.44 is: 2,975.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.84 : 3,887.20 = 2,155.44 : x
  2. Step 2: Convert to fraction form
    2,815.84/3,887.20 = 2,155.44/x
  3. Step 3: Cross multiply
    2,815.84x = 3,887.20 × 2,155.44
  4. Step 4: Simplify right side
    2,815.84x = 8,378,626.37
  5. Step 5: Solve for x
    x = 8,378,626.37/2,815.84
  6. Step 6: Final answer
    x = 2,975.53

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1.5x scale

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.