Home / 2,812.40-4,218.60-1,890.80

Finding the Fourth Proportional to 2,812.40, 4,218.60 and 1,890.80

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Solution

The fourth proportional to 2,812.40, 4,218.60 and 1,890.80 is: 2,836.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,812.40 : 4,218.60 = 1,890.80 : x
  2. Step 2: Convert to fraction form
    2,812.40/4,218.60 = 1,890.80/x
  3. Step 3: Cross multiply
    2,812.40x = 4,218.60 × 1,890.80
  4. Step 4: Simplify right side
    2,812.40x = 7,976,528.88
  5. Step 5: Solve for x
    x = 7,976,528.88/2,812.40
  6. Step 6: Final answer
    x = 2,836.20

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1.5x scale

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.