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Finding the Fourth Proportional to 20,958.98, 31,442.36 and 6,919.99

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Solution

The fourth proportional to 20,958.98, 31,442.36 and 6,919.99 is: 10,381.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,958.98 : 31,442.36 = 6,919.99 : x
  2. Step 2: Convert to fraction form
    20,958.98/31,442.36 = 6,919.99/x
  3. Step 3: Cross multiply
    20,958.98x = 31,442.36 × 6,919.99
  4. Step 4: Simplify right side
    20,958.98x = 217,580,816.78
  5. Step 5: Solve for x
    x = 217,580,816.78/20,958.98
  6. Step 6: Final answer
    x = 10,381.27

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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.