Home / 20,855.32-28,780.31-11,905.63

Finding the Fourth Proportional to 20,855.32, 28,780.31 and 11,905.63

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Solution

The fourth proportional to 20,855.32, 28,780.31 and 11,905.63 is: 16,429.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.32 : 28,780.31 = 11,905.63 : x
  2. Step 2: Convert to fraction form
    20,855.32/28,780.31 = 11,905.63/x
  3. Step 3: Cross multiply
    20,855.32x = 28,780.31 × 11,905.63
  4. Step 4: Simplify right side
    20,855.32x = 342,647,841.85
  5. Step 5: Solve for x
    x = 342,647,841.85/20,855.32
  6. Step 6: Final answer
    x = 16,429.75

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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.