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Finding the Fourth Proportional to 13,791.81, 20,692.71 and 8,520.67

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Solution

The fourth proportional to 13,791.81, 20,692.71 and 8,520.67 is: 12,784.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,791.81 : 20,692.71 = 8,520.67 : x
  2. Step 2: Convert to fraction form
    13,791.81/20,692.71 = 8,520.67/x
  3. Step 3: Cross multiply
    13,791.81x = 20,692.71 × 8,520.67
  4. Step 4: Simplify right side
    13,791.81x = 176,315,701.58
  5. Step 5: Solve for x
    x = 176,315,701.58/13,791.81
  6. Step 6: Final answer
    x = 12,784.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.