Home / 13,809.80-20,690.40-11,331.20

Finding the Fourth Proportional to 13,809.80, 20,690.40 and 11,331.20

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Solution

The fourth proportional to 13,809.80, 20,690.40 and 11,331.20 is: 16,976.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,809.80 : 20,690.40 = 11,331.20 : x
  2. Step 2: Convert to fraction form
    13,809.80/20,690.40 = 11,331.20/x
  3. Step 3: Cross multiply
    13,809.80x = 20,690.40 × 11,331.20
  4. Step 4: Simplify right side
    13,809.80x = 234,447,060.48
  5. Step 5: Solve for x
    x = 234,447,060.48/13,809.80
  6. Step 6: Final answer
    x = 16,976.86

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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.