Home / 2,120.60-3,180.90-1,429.40

Finding the Fourth Proportional to 2,120.60, 3,180.90 and 1,429.40

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Solution

The fourth proportional to 2,120.60, 3,180.90 and 1,429.40 is: 2,144.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.60 : 3,180.90 = 1,429.40 : x
  2. Step 2: Convert to fraction form
    2,120.60/3,180.90 = 1,429.40/x
  3. Step 3: Cross multiply
    2,120.60x = 3,180.90 × 1,429.40
  4. Step 4: Simplify right side
    2,120.60x = 4,546,778.46
  5. Step 5: Solve for x
    x = 4,546,778.46/2,120.60
  6. Step 6: Final answer
    x = 2,144.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.