Home / 2,105.87-2,907.09-1,221.35

Finding the Fourth Proportional to 2,105.87, 2,907.09 and 1,221.35

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Solution

The fourth proportional to 2,105.87, 2,907.09 and 1,221.35 is: 1,686.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,105.87 : 2,907.09 = 1,221.35 : x
  2. Step 2: Convert to fraction form
    2,105.87/2,907.09 = 1,221.35/x
  3. Step 3: Cross multiply
    2,105.87x = 2,907.09 × 1,221.35
  4. Step 4: Simplify right side
    2,105.87x = 3,550,559.84
  5. Step 5: Solve for x
    x = 3,550,559.84/2,105.87
  6. Step 6: Final answer
    x = 1,686.03

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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.