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Finding the Fourth Proportional to 11,855.63, 17,819.44 and 7,920.85

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Solution

The fourth proportional to 11,855.63, 17,819.44 and 7,920.85 is: 11,905.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,855.63 : 17,819.44 = 7,920.85 : x
  2. Step 2: Convert to fraction form
    11,855.63/17,819.44 = 7,920.85/x
  3. Step 3: Cross multiply
    11,855.63x = 17,819.44 × 7,920.85
  4. Step 4: Simplify right side
    11,855.63x = 141,145,111.32
  5. Step 5: Solve for x
    x = 141,145,111.32/11,855.63
  6. Step 6: Final answer
    x = 11,905.32

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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.