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Finding the Fourth Proportional to 28,910.80, 43,366.20 and 21,912.40

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Solution

The fourth proportional to 28,910.80, 43,366.20 and 21,912.40 is: 32,868.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,910.80 : 43,366.20 = 21,912.40 : x
  2. Step 2: Convert to fraction form
    28,910.80/43,366.20 = 21,912.40/x
  3. Step 3: Cross multiply
    28,910.80x = 43,366.20 × 21,912.40
  4. Step 4: Simplify right side
    28,910.80x = 950,257,520.88
  5. Step 5: Solve for x
    x = 950,257,520.88/28,910.80
  6. Step 6: Final answer
    x = 32,868.60

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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.