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Finding the Fourth Proportional to 20,830.40, 31,245.60 and 6,979.40

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Solution

The fourth proportional to 20,830.40, 31,245.60 and 6,979.40 is: 10,469.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,830.40 : 31,245.60 = 6,979.40 : x
  2. Step 2: Convert to fraction form
    20,830.40/31,245.60 = 6,979.40/x
  3. Step 3: Cross multiply
    20,830.40x = 31,245.60 × 6,979.40
  4. Step 4: Simplify right side
    20,830.40x = 218,075,540.64
  5. Step 5: Solve for x
    x = 218,075,540.64/20,830.40
  6. Step 6: Final answer
    x = 10,469.10

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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.