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Finding the Fourth Proportional to 2,812.88, 3,883.20 and 2,028.80

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Solution

The fourth proportional to 2,812.88, 3,883.20 and 2,028.80 is: 2,800.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,812.88 : 3,883.20 = 2,028.80 : x
  2. Step 2: Convert to fraction form
    2,812.88/3,883.20 = 2,028.80/x
  3. Step 3: Cross multiply
    2,812.88x = 3,883.20 × 2,028.80
  4. Step 4: Simplify right side
    2,812.88x = 7,878,236.16
  5. Step 5: Solve for x
    x = 7,878,236.16/2,812.88
  6. Step 6: Final answer
    x = 2,800.77

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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.