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Finding the Fourth Proportional to 13,308.80, 19,963.20 and 12,099.20

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Solution

The fourth proportional to 13,308.80, 19,963.20 and 12,099.20 is: 18,148.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,308.80 : 19,963.20 = 12,099.20 : x
  2. Step 2: Convert to fraction form
    13,308.80/19,963.20 = 12,099.20/x
  3. Step 3: Cross multiply
    13,308.80x = 19,963.20 × 12,099.20
  4. Step 4: Simplify right side
    13,308.80x = 241,538,749.44
  5. Step 5: Solve for x
    x = 241,538,749.44/13,308.80
  6. Step 6: Final answer
    x = 18,148.80

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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.