Home / 20,778.52-28,673.22-12,821.32

Finding the Fourth Proportional to 20,778.52, 28,673.22 and 12,821.32

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Solution

The fourth proportional to 20,778.52, 28,673.22 and 12,821.32 is: 17,692.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,778.52 : 28,673.22 = 12,821.32 : x
  2. Step 2: Convert to fraction form
    20,778.52/28,673.22 = 12,821.32/x
  3. Step 3: Cross multiply
    20,778.52x = 28,673.22 × 12,821.32
  4. Step 4: Simplify right side
    20,778.52x = 367,628,529.05
  5. Step 5: Solve for x
    x = 367,628,529.05/20,778.52
  6. Step 6: Final answer
    x = 17,692.72

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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.