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Finding the Fourth Proportional to 13,899.20, 20,841.60 and 5,129.60

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Solution

The fourth proportional to 13,899.20, 20,841.60 and 5,129.60 is: 7,691.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,899.20 : 20,841.60 = 5,129.60 : x
  2. Step 2: Convert to fraction form
    13,899.20/20,841.60 = 5,129.60/x
  3. Step 3: Cross multiply
    13,899.20x = 20,841.60 × 5,129.60
  4. Step 4: Simplify right side
    13,899.20x = 106,909,071.36
  5. Step 5: Solve for x
    x = 106,909,071.36/13,899.20
  6. Step 6: Final answer
    x = 7,691.74

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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.