Home / 3,128.06-4,311.71-2,119.46

Finding the Fourth Proportional to 3,128.06, 4,311.71 and 2,119.46

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Solution

The fourth proportional to 3,128.06, 4,311.71 and 2,119.46 is: 2,921.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,128.06 : 4,311.71 = 2,119.46 : x
  2. Step 2: Convert to fraction form
    3,128.06/4,311.71 = 2,119.46/x
  3. Step 3: Cross multiply
    3,128.06x = 4,311.71 × 2,119.46
  4. Step 4: Simplify right side
    3,128.06x = 9,138,475.32
  5. Step 5: Solve for x
    x = 9,138,475.32/3,128.06
  6. Step 6: Final answer
    x = 2,921.46

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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.