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Finding the Fourth Proportional to 18,984.80, 28,500.60 and 11,964.80

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Solution

The fourth proportional to 18,984.80, 28,500.60 and 11,964.80 is: 17,961.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,984.80 : 28,500.60 = 11,964.80 : x
  2. Step 2: Convert to fraction form
    18,984.80/28,500.60 = 11,964.80/x
  3. Step 3: Cross multiply
    18,984.80x = 28,500.60 × 11,964.80
  4. Step 4: Simplify right side
    18,984.80x = 341,003,978.88
  5. Step 5: Solve for x
    x = 341,003,978.88/18,984.80
  6. Step 6: Final answer
    x = 17,961.95

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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.