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Finding the Fourth Proportional to 28,912.86, 39,912.72 and 16,976.94

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Solution

The fourth proportional to 28,912.86, 39,912.72 and 16,976.94 is: 23,435.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,912.86 : 39,912.72 = 16,976.94 : x
  2. Step 2: Convert to fraction form
    28,912.86/39,912.72 = 16,976.94/x
  3. Step 3: Cross multiply
    28,912.86x = 39,912.72 × 16,976.94
  4. Step 4: Simplify right side
    28,912.86x = 677,595,852.68
  5. Step 5: Solve for x
    x = 677,595,852.68/28,912.86
  6. Step 6: Final answer
    x = 23,435.79

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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.