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Finding the Fourth Proportional to 19,021.20, 28,531.80 and 8,491.20

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Solution

The fourth proportional to 19,021.20, 28,531.80 and 8,491.20 is: 12,736.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,021.20 : 28,531.80 = 8,491.20 : x
  2. Step 2: Convert to fraction form
    19,021.20/28,531.80 = 8,491.20/x
  3. Step 3: Cross multiply
    19,021.20x = 28,531.80 × 8,491.20
  4. Step 4: Simplify right side
    19,021.20x = 242,269,220.16
  5. Step 5: Solve for x
    x = 242,269,220.16/19,021.20
  6. Step 6: Final answer
    x = 12,736.80

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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.