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Finding the Fourth Proportional to 12,990, 19,485.36 and 3,756

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Solution

The fourth proportional to 12,990, 19,485.36 and 3,756 is: 5,634.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,990 : 19,485.36 = 3,756 : x
  2. Step 2: Convert to fraction form
    12,990/19,485.36 = 3,756/x
  3. Step 3: Cross multiply
    12,990x = 19,485.36 × 3,756
  4. Step 4: Simplify right side
    12,990x = 73,187,012.16
  5. Step 5: Solve for x
    x = 73,187,012.16/12,990
  6. Step 6: Final answer
    x = 5,634.10

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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.