Home / 12,620.40-18,930.52-3,855.28

Finding the Fourth Proportional to 12,620.40, 18,930.52 and 3,855.28

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Solution

The fourth proportional to 12,620.40, 18,930.52 and 3,855.28 is: 5,782.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,620.40 : 18,930.52 = 3,855.28 : x
  2. Step 2: Convert to fraction form
    12,620.40/18,930.52 = 3,855.28/x
  3. Step 3: Cross multiply
    12,620.40x = 18,930.52 × 3,855.28
  4. Step 4: Simplify right side
    12,620.40x = 72,982,455.15
  5. Step 5: Solve for x
    x = 72,982,455.15/12,620.40
  6. Step 6: Final answer
    x = 5,782.90

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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.