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Finding the Fourth Proportional to 3,107.95, 4,287.08 and 1,988.49

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Solution

The fourth proportional to 3,107.95, 4,287.08 and 1,988.49 is: 2,742.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,107.95 : 4,287.08 = 1,988.49 : x
  2. Step 2: Convert to fraction form
    3,107.95/4,287.08 = 1,988.49/x
  3. Step 3: Cross multiply
    3,107.95x = 4,287.08 × 1,988.49
  4. Step 4: Simplify right side
    3,107.95x = 8,524,820.68
  5. Step 5: Solve for x
    x = 8,524,820.68/3,107.95
  6. Step 6: Final answer
    x = 2,742.91

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.