Home / 2,871.90-3,957.84-1,986.12

Finding the Fourth Proportional to 2,871.90, 3,957.84 and 1,986.12

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Solution

The fourth proportional to 2,871.90, 3,957.84 and 1,986.12 is: 2,737.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,871.90 : 3,957.84 = 1,986.12 : x
  2. Step 2: Convert to fraction form
    2,871.90/3,957.84 = 1,986.12/x
  3. Step 3: Cross multiply
    2,871.90x = 3,957.84 × 1,986.12
  4. Step 4: Simplify right side
    2,871.90x = 7,860,745.18
  5. Step 5: Solve for x
    x = 7,860,745.18/2,871.90
  6. Step 6: Final answer
    x = 2,737.12

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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.