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Finding the Fourth Proportional to 20,958.05, 31,440.95 and 6,919.05

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Solution

The fourth proportional to 20,958.05, 31,440.95 and 6,919.05 is: 10,379.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,958.05 : 31,440.95 = 6,919.05 : x
  2. Step 2: Convert to fraction form
    20,958.05/31,440.95 = 6,919.05/x
  3. Step 3: Cross multiply
    20,958.05x = 31,440.95 × 6,919.05
  4. Step 4: Simplify right side
    20,958.05x = 217,541,505.10
  5. Step 5: Solve for x
    x = 217,541,505.10/20,958.05
  6. Step 6: Final answer
    x = 10,379.85

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1.5x scale

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.