Home / 3,928.12-5,420.22-2,159.80

Finding the Fourth Proportional to 3,928.12, 5,420.22 and 2,159.80

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Solution

The fourth proportional to 3,928.12, 5,420.22 and 2,159.80 is: 2,980.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928.12 : 5,420.22 = 2,159.80 : x
  2. Step 2: Convert to fraction form
    3,928.12/5,420.22 = 2,159.80/x
  3. Step 3: Cross multiply
    3,928.12x = 5,420.22 × 2,159.80
  4. Step 4: Simplify right side
    3,928.12x = 11,706,591.16
  5. Step 5: Solve for x
    x = 11,706,591.16/3,928.12
  6. Step 6: Final answer
    x = 2,980.20

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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.