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Finding the Fourth Proportional to 13,692.80, 20,558.40 and 8,508.80

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Solution

The fourth proportional to 13,692.80, 20,558.40 and 8,508.80 is: 12,775.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,692.80 : 20,558.40 = 8,508.80 : x
  2. Step 2: Convert to fraction form
    13,692.80/20,558.40 = 8,508.80/x
  3. Step 3: Cross multiply
    13,692.80x = 20,558.40 × 8,508.80
  4. Step 4: Simplify right side
    13,692.80x = 174,927,313.92
  5. Step 5: Solve for x
    x = 174,927,313.92/13,692.80
  6. Step 6: Final answer
    x = 12,775.13

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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.