Home / 13,955.40-20,930.70-5,185.80

Finding the Fourth Proportional to 13,955.40, 20,930.70 and 5,185.80

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Solution

The fourth proportional to 13,955.40, 20,930.70 and 5,185.80 is: 7,777.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,955.40 : 20,930.70 = 5,185.80 : x
  2. Step 2: Convert to fraction form
    13,955.40/20,930.70 = 5,185.80/x
  3. Step 3: Cross multiply
    13,955.40x = 20,930.70 × 5,185.80
  4. Step 4: Simplify right side
    13,955.40x = 108,542,424.06
  5. Step 5: Solve for x
    x = 108,542,424.06/13,955.40
  6. Step 6: Final answer
    x = 7,777.81

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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.