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Finding the Fourth Proportional to 2,825.15, 3,900.07 and 1,986.58

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Solution

The fourth proportional to 2,825.15, 3,900.07 and 1,986.58 is: 2,742.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,825.15 : 3,900.07 = 1,986.58 : x
  2. Step 2: Convert to fraction form
    2,825.15/3,900.07 = 1,986.58/x
  3. Step 3: Cross multiply
    2,825.15x = 3,900.07 × 1,986.58
  4. Step 4: Simplify right side
    2,825.15x = 7,747,801.06
  5. Step 5: Solve for x
    x = 7,747,801.06/2,825.15
  6. Step 6: Final answer
    x = 2,742.44

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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.