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Finding the Fourth Proportional to 15,879.94, 21,915 and 8,806.36

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Solution

The fourth proportional to 15,879.94, 21,915 and 8,806.36 is: 12,153.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,879.94 : 21,915 = 8,806.36 : x
  2. Step 2: Convert to fraction form
    15,879.94/21,915 = 8,806.36/x
  3. Step 3: Cross multiply
    15,879.94x = 21,915 × 8,806.36
  4. Step 4: Simplify right side
    15,879.94x = 192,991,379.40
  5. Step 5: Solve for x
    x = 192,991,379.40/15,879.94
  6. Step 6: Final answer
    x = 12,153.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.