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Finding the Fourth Proportional to 19,220.80, 28,854.60 and 12,200.80

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Solution

The fourth proportional to 19,220.80, 28,854.60 and 12,200.80 is: 18,316.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,220.80 : 28,854.60 = 12,200.80 : x
  2. Step 2: Convert to fraction form
    19,220.80/28,854.60 = 12,200.80/x
  3. Step 3: Cross multiply
    19,220.80x = 28,854.60 × 12,200.80
  4. Step 4: Simplify right side
    19,220.80x = 352,049,203.68
  5. Step 5: Solve for x
    x = 352,049,203.68/19,220.80
  6. Step 6: Final answer
    x = 18,316.05

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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.