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Finding the Fourth Proportional to 18,821.88, 28,232.94 and 5,674.20

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Solution

The fourth proportional to 18,821.88, 28,232.94 and 5,674.20 is: 8,511.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,821.88 : 28,232.94 = 5,674.20 : x
  2. Step 2: Convert to fraction form
    18,821.88/28,232.94 = 5,674.20/x
  3. Step 3: Cross multiply
    18,821.88x = 28,232.94 × 5,674.20
  4. Step 4: Simplify right side
    18,821.88x = 160,199,348.15
  5. Step 5: Solve for x
    x = 160,199,348.15/18,821.88
  6. Step 6: Final answer
    x = 8,511.34

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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.