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Finding the Fourth Proportional to 13,430.80, 20,124.60 and 8,491.60

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Solution

The fourth proportional to 13,430.80, 20,124.60 and 8,491.60 is: 12,723.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,430.80 : 20,124.60 = 8,491.60 : x
  2. Step 2: Convert to fraction form
    13,430.80/20,124.60 = 8,491.60/x
  3. Step 3: Cross multiply
    13,430.80x = 20,124.60 × 8,491.60
  4. Step 4: Simplify right side
    13,430.80x = 170,890,053.36
  5. Step 5: Solve for x
    x = 170,890,053.36/13,430.80
  6. Step 6: Final answer
    x = 12,723.74

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.