Home / 20,782.80-28,680.23-11,351.36

Finding the Fourth Proportional to 20,782.80, 28,680.23 and 11,351.36

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Solution

The fourth proportional to 20,782.80, 28,680.23 and 11,351.36 is: 15,664.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,782.80 : 28,680.23 = 11,351.36 : x
  2. Step 2: Convert to fraction form
    20,782.80/28,680.23 = 11,351.36/x
  3. Step 3: Cross multiply
    20,782.80x = 28,680.23 × 11,351.36
  4. Step 4: Simplify right side
    20,782.80x = 325,559,415.45
  5. Step 5: Solve for x
    x = 325,559,415.45/20,782.80
  6. Step 6: Final answer
    x = 15,664.85

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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.