Home / 20,380.94-28,113.74-12,815.28

Finding the Fourth Proportional to 20,380.94, 28,113.74 and 12,815.28

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Solution

The fourth proportional to 20,380.94, 28,113.74 and 12,815.28 is: 17,677.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,380.94 : 28,113.74 = 12,815.28 : x
  2. Step 2: Convert to fraction form
    20,380.94/28,113.74 = 12,815.28/x
  3. Step 3: Cross multiply
    20,380.94x = 28,113.74 × 12,815.28
  4. Step 4: Simplify right side
    20,380.94x = 360,285,449.95
  5. Step 5: Solve for x
    x = 360,285,449.95/20,380.94
  6. Step 6: Final answer
    x = 17,677.57

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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.