Home / 13,980.30-20,970.40-4,119.56

Finding the Fourth Proportional to 13,980.30, 20,970.40 and 4,119.56

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Solution

The fourth proportional to 13,980.30, 20,970.40 and 4,119.56 is: 6,179.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,980.30 : 20,970.40 = 4,119.56 : x
  2. Step 2: Convert to fraction form
    13,980.30/20,970.40 = 4,119.56/x
  3. Step 3: Cross multiply
    13,980.30x = 20,970.40 × 4,119.56
  4. Step 4: Simplify right side
    13,980.30x = 86,388,821.02
  5. Step 5: Solve for x
    x = 86,388,821.02/13,980.30
  6. Step 6: Final answer
    x = 6,179.33

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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.