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Finding the Fourth Proportional to 19,979.88, 29,969.94 and 8,133.88

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Solution

The fourth proportional to 19,979.88, 29,969.94 and 8,133.88 is: 12,200.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,979.88 : 29,969.94 = 8,133.88 : x
  2. Step 2: Convert to fraction form
    19,979.88/29,969.94 = 8,133.88/x
  3. Step 3: Cross multiply
    19,979.88x = 29,969.94 × 8,133.88
  4. Step 4: Simplify right side
    19,979.88x = 243,771,895.57
  5. Step 5: Solve for x
    x = 243,771,895.57/19,979.88
  6. Step 6: Final answer
    x = 12,200.87

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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.