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Finding the Fourth Proportional to 20,847.78, 28,769.04 and 12,890.88

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Solution

The fourth proportional to 20,847.78, 28,769.04 and 12,890.88 is: 17,788.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,847.78 : 28,769.04 = 12,890.88 : x
  2. Step 2: Convert to fraction form
    20,847.78/28,769.04 = 12,890.88/x
  3. Step 3: Cross multiply
    20,847.78x = 28,769.04 × 12,890.88
  4. Step 4: Simplify right side
    20,847.78x = 370,858,242.36
  5. Step 5: Solve for x
    x = 370,858,242.36/20,847.78
  6. Step 6: Final answer
    x = 17,788.86

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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.