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Finding the Fourth Proportional to 12,990.88, 19,489.62 and 3,630.90

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Solution

The fourth proportional to 12,990.88, 19,489.62 and 3,630.90 is: 5,447.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,990.88 : 19,489.62 = 3,630.90 : x
  2. Step 2: Convert to fraction form
    12,990.88/19,489.62 = 3,630.90/x
  3. Step 3: Cross multiply
    12,990.88x = 19,489.62 × 3,630.90
  4. Step 4: Simplify right side
    12,990.88x = 70,764,861.26
  5. Step 5: Solve for x
    x = 70,764,861.26/12,990.88
  6. Step 6: Final answer
    x = 5,447.27

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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.