Home / 3,185.40-4,395.50-1,991.35

Finding the Fourth Proportional to 3,185.40, 4,395.50 and 1,991.35

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Solution

The fourth proportional to 3,185.40, 4,395.50 and 1,991.35 is: 2,747.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,185.40 : 4,395.50 = 1,991.35 : x
  2. Step 2: Convert to fraction form
    3,185.40/4,395.50 = 1,991.35/x
  3. Step 3: Cross multiply
    3,185.40x = 4,395.50 × 1,991.35
  4. Step 4: Simplify right side
    3,185.40x = 8,752,957.98
  5. Step 5: Solve for x
    x = 8,752,957.98/3,185.40
  6. Step 6: Final answer
    x = 2,747.84

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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.