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Finding the Fourth Proportional to 3,102.80, 4,284.80 and 2,811.20

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Solution

The fourth proportional to 3,102.80, 4,284.80 and 2,811.20 is: 3,882.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,102.80 : 4,284.80 = 2,811.20 : x
  2. Step 2: Convert to fraction form
    3,102.80/4,284.80 = 2,811.20/x
  3. Step 3: Cross multiply
    3,102.80x = 4,284.80 × 2,811.20
  4. Step 4: Simplify right side
    3,102.80x = 12,045,429.76
  5. Step 5: Solve for x
    x = 12,045,429.76/3,102.80
  6. Step 6: Final answer
    x = 3,882.12

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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.