Home / 13,828.80-20,720.40-7,975.20

Finding the Fourth Proportional to 13,828.80, 20,720.40 and 7,975.20

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Solution

The fourth proportional to 13,828.80, 20,720.40 and 7,975.20 is: 11,949.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,828.80 : 20,720.40 = 7,975.20 : x
  2. Step 2: Convert to fraction form
    13,828.80/20,720.40 = 7,975.20/x
  3. Step 3: Cross multiply
    13,828.80x = 20,720.40 × 7,975.20
  4. Step 4: Simplify right side
    13,828.80x = 165,249,334.08
  5. Step 5: Solve for x
    x = 165,249,334.08/13,828.80
  6. Step 6: Final answer
    x = 11,949.65

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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.