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Finding the Fourth Proportional to 18,979.40, 28,469.10 and 5,128.40

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Solution

The fourth proportional to 18,979.40, 28,469.10 and 5,128.40 is: 7,692.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979.40 : 28,469.10 = 5,128.40 : x
  2. Step 2: Convert to fraction form
    18,979.40/28,469.10 = 5,128.40/x
  3. Step 3: Cross multiply
    18,979.40x = 28,469.10 × 5,128.40
  4. Step 4: Simplify right side
    18,979.40x = 146,000,932.44
  5. Step 5: Solve for x
    x = 146,000,932.44/18,979.40
  6. Step 6: Final answer
    x = 7,692.60

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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.