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Finding the Fourth Proportional to 20,793.63, 28,698.45 and 13,243.21

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Solution

The fourth proportional to 20,793.63, 28,698.45 and 13,243.21 is: 18,277.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,793.63 : 28,698.45 = 13,243.21 : x
  2. Step 2: Convert to fraction form
    20,793.63/28,698.45 = 13,243.21/x
  3. Step 3: Cross multiply
    20,793.63x = 28,698.45 × 13,243.21
  4. Step 4: Simplify right side
    20,793.63x = 380,059,600.02
  5. Step 5: Solve for x
    x = 380,059,600.02/20,793.63
  6. Step 6: Final answer
    x = 18,277.69

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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.