Home / 20,790.80-28,690.41-11,359.40

Finding the Fourth Proportional to 20,790.80, 28,690.41 and 11,359.40

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Solution

The fourth proportional to 20,790.80, 28,690.41 and 11,359.40 is: 15,675.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,790.80 : 28,690.41 = 11,359.40 : x
  2. Step 2: Convert to fraction form
    20,790.80/28,690.41 = 11,359.40/x
  3. Step 3: Cross multiply
    20,790.80x = 28,690.41 × 11,359.40
  4. Step 4: Simplify right side
    20,790.80x = 325,905,843.35
  5. Step 5: Solve for x
    x = 325,905,843.35/20,790.80
  6. Step 6: Final answer
    x = 15,675.48

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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.