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Finding the Fourth Proportional to 19,879.28, 29,796.70 and 8,621.63

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Solution

The fourth proportional to 19,879.28, 29,796.70 and 8,621.63 is: 12,922.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,879.28 : 29,796.70 = 8,621.63 : x
  2. Step 2: Convert to fraction form
    19,879.28/29,796.70 = 8,621.63/x
  3. Step 3: Cross multiply
    19,879.28x = 29,796.70 × 8,621.63
  4. Step 4: Simplify right side
    19,879.28x = 256,895,973.64
  5. Step 5: Solve for x
    x = 256,895,973.64/19,879.28
  6. Step 6: Final answer
    x = 12,922.80

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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.