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Finding the Fourth Proportional to 13,460.80, 20,143.20 and 8,532.80

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Solution

The fourth proportional to 13,460.80, 20,143.20 and 8,532.80 is: 12,768.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,460.80 : 20,143.20 = 8,532.80 : x
  2. Step 2: Convert to fraction form
    13,460.80/20,143.20 = 8,532.80/x
  3. Step 3: Cross multiply
    13,460.80x = 20,143.20 × 8,532.80
  4. Step 4: Simplify right side
    13,460.80x = 171,877,896.96
  5. Step 5: Solve for x
    x = 171,877,896.96/13,460.80
  6. Step 6: Final answer
    x = 12,768.77

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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.