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Finding the Fourth Proportional to 13,511.60, 20,260.20 and 5,711.60

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Solution

The fourth proportional to 13,511.60, 20,260.20 and 5,711.60 is: 8,564.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,511.60 : 20,260.20 = 5,711.60 : x
  2. Step 2: Convert to fraction form
    13,511.60/20,260.20 = 5,711.60/x
  3. Step 3: Cross multiply
    13,511.60x = 20,260.20 × 5,711.60
  4. Step 4: Simplify right side
    13,511.60x = 115,718,158.32
  5. Step 5: Solve for x
    x = 115,718,158.32/13,511.60
  6. Step 6: Final answer
    x = 8,564.36

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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.