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Finding the Fourth Proportional to 19,011.20, 28,516.80 and 8,481.20

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Solution

The fourth proportional to 19,011.20, 28,516.80 and 8,481.20 is: 12,721.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,011.20 : 28,516.80 = 8,481.20 : x
  2. Step 2: Convert to fraction form
    19,011.20/28,516.80 = 8,481.20/x
  3. Step 3: Cross multiply
    19,011.20x = 28,516.80 × 8,481.20
  4. Step 4: Simplify right side
    19,011.20x = 241,856,684.16
  5. Step 5: Solve for x
    x = 241,856,684.16/19,011.20
  6. Step 6: Final answer
    x = 12,721.80

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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.