Home / 20,815.96-28,724.97-12,858.88

Finding the Fourth Proportional to 20,815.96, 28,724.97 and 12,858.88

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Solution

The fourth proportional to 20,815.96, 28,724.97 and 12,858.88 is: 17,744.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.96 : 28,724.97 = 12,858.88 : x
  2. Step 2: Convert to fraction form
    20,815.96/28,724.97 = 12,858.88/x
  3. Step 3: Cross multiply
    20,815.96x = 28,724.97 × 12,858.88
  4. Step 4: Simplify right side
    20,815.96x = 369,370,942.23
  5. Step 5: Solve for x
    x = 369,370,942.23/20,815.96
  6. Step 6: Final answer
    x = 17,744.60

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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.