Home / 20,804.54-28,711.40-12,311.69

Finding the Fourth Proportional to 20,804.54, 28,711.40 and 12,311.69

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Solution

The fourth proportional to 20,804.54, 28,711.40 and 12,311.69 is: 16,990.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,804.54 : 28,711.40 = 12,311.69 : x
  2. Step 2: Convert to fraction form
    20,804.54/28,711.40 = 12,311.69/x
  3. Step 3: Cross multiply
    20,804.54x = 28,711.40 × 12,311.69
  4. Step 4: Simplify right side
    20,804.54x = 353,485,651.15
  5. Step 5: Solve for x
    x = 353,485,651.15/20,804.54
  6. Step 6: Final answer
    x = 16,990.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.