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Finding the Fourth Proportional to 15,879.58, 21,912.78 and 8,805.76

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Solution

The fourth proportional to 15,879.58, 21,912.78 and 8,805.76 is: 12,151.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,879.58 : 21,912.78 = 8,805.76 : x
  2. Step 2: Convert to fraction form
    15,879.58/21,912.78 = 8,805.76/x
  3. Step 3: Cross multiply
    15,879.58x = 21,912.78 × 8,805.76
  4. Step 4: Simplify right side
    15,879.58x = 192,958,681.61
  5. Step 5: Solve for x
    x = 192,958,681.61/15,879.58
  6. Step 6: Final answer
    x = 12,151.37

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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.