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Finding the Fourth Proportional to 13,891.60, 20,858.46 and 12,135.52

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Solution

The fourth proportional to 13,891.60, 20,858.46 and 12,135.52 is: 18,221.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,891.60 : 20,858.46 = 12,135.52 : x
  2. Step 2: Convert to fraction form
    13,891.60/20,858.46 = 12,135.52/x
  3. Step 3: Cross multiply
    13,891.60x = 20,858.46 × 12,135.52
  4. Step 4: Simplify right side
    13,891.60x = 253,128,258.50
  5. Step 5: Solve for x
    x = 253,128,258.50/13,891.60
  6. Step 6: Final answer
    x = 18,221.68

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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.