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Finding the Fourth Proportional to 20,667, 28,520.39 and 11,235.50

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Solution

The fourth proportional to 20,667, 28,520.39 and 11,235.50 is: 15,504.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,667 : 28,520.39 = 11,235.50 : x
  2. Step 2: Convert to fraction form
    20,667/28,520.39 = 11,235.50/x
  3. Step 3: Cross multiply
    20,667x = 28,520.39 × 11,235.50
  4. Step 4: Simplify right side
    20,667x = 320,440,699.24
  5. Step 5: Solve for x
    x = 320,440,699.24/20,667
  6. Step 6: Final answer
    x = 15,504.95

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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.