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Finding the Fourth Proportional to 20,940.76, 28,899.90 and 11,991.08

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Solution

The fourth proportional to 20,940.76, 28,899.90 and 11,991.08 is: 16,548.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,940.76 : 28,899.90 = 11,991.08 : x
  2. Step 2: Convert to fraction form
    20,940.76/28,899.90 = 11,991.08/x
  3. Step 3: Cross multiply
    20,940.76x = 28,899.90 × 11,991.08
  4. Step 4: Simplify right side
    20,940.76x = 346,541,012.89
  5. Step 5: Solve for x
    x = 346,541,012.89/20,940.76
  6. Step 6: Final answer
    x = 16,548.64

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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.