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Finding the Fourth Proportional to 19,890.60, 29,824.54 and 8,189.88

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Solution

The fourth proportional to 19,890.60, 29,824.54 and 8,189.88 is: 12,280.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,890.60 : 29,824.54 = 8,189.88 : x
  2. Step 2: Convert to fraction form
    19,890.60/29,824.54 = 8,189.88/x
  3. Step 3: Cross multiply
    19,890.60x = 29,824.54 × 8,189.88
  4. Step 4: Simplify right side
    19,890.60x = 244,259,403.66
  5. Step 5: Solve for x
    x = 244,259,403.66/19,890.60
  6. Step 6: Final answer
    x = 12,280.14

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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.