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Finding the Fourth Proportional to 20,855.76, 28,783.71 and 11,901.21

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Solution

The fourth proportional to 20,855.76, 28,783.71 and 11,901.21 is: 16,425.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.76 : 28,783.71 = 11,901.21 : x
  2. Step 2: Convert to fraction form
    20,855.76/28,783.71 = 11,901.21/x
  3. Step 3: Cross multiply
    20,855.76x = 28,783.71 × 11,901.21
  4. Step 4: Simplify right side
    20,855.76x = 342,560,977.29
  5. Step 5: Solve for x
    x = 342,560,977.29/20,855.76
  6. Step 6: Final answer
    x = 16,425.25

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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.