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Finding the Fourth Proportional to 11,920.34, 17,879.12 and 3,155.94

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Solution

The fourth proportional to 11,920.34, 17,879.12 and 3,155.94 is: 4,733.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,920.34 : 17,879.12 = 3,155.94 : x
  2. Step 2: Convert to fraction form
    11,920.34/17,879.12 = 3,155.94/x
  3. Step 3: Cross multiply
    11,920.34x = 17,879.12 × 3,155.94
  4. Step 4: Simplify right side
    11,920.34x = 56,425,429.97
  5. Step 5: Solve for x
    x = 56,425,429.97/11,920.34
  6. Step 6: Final answer
    x = 4,733.54

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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.