Home / 3,485.40-5,213.70-3,139.80

Finding the Fourth Proportional to 3,485.40, 5,213.70 and 3,139.80

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Solution

The fourth proportional to 3,485.40, 5,213.70 and 3,139.80 is: 4,696.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,485.40 : 5,213.70 = 3,139.80 : x
  2. Step 2: Convert to fraction form
    3,485.40/5,213.70 = 3,139.80/x
  3. Step 3: Cross multiply
    3,485.40x = 5,213.70 × 3,139.80
  4. Step 4: Simplify right side
    3,485.40x = 16,369,975.26
  5. Step 5: Solve for x
    x = 16,369,975.26/3,485.40
  6. Step 6: Final answer
    x = 4,696.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.