Home / 2,840.21-3,920.69-1,909.25

Finding the Fourth Proportional to 2,840.21, 3,920.69 and 1,909.25

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Solution

The fourth proportional to 2,840.21, 3,920.69 and 1,909.25 is: 2,635.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,840.21 : 3,920.69 = 1,909.25 : x
  2. Step 2: Convert to fraction form
    2,840.21/3,920.69 = 1,909.25/x
  3. Step 3: Cross multiply
    2,840.21x = 3,920.69 × 1,909.25
  4. Step 4: Simplify right side
    2,840.21x = 7,485,562.55
  5. Step 5: Solve for x
    x = 7,485,562.55/2,840.21
  6. Step 6: Final answer
    x = 2,635.57

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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.