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Finding the Fourth Proportional to 19,379.20, 29,020.20 and 12,769.60

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Solution

The fourth proportional to 19,379.20, 29,020.20 and 12,769.60 is: 19,122.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,379.20 : 29,020.20 = 12,769.60 : x
  2. Step 2: Convert to fraction form
    19,379.20/29,020.20 = 12,769.60/x
  3. Step 3: Cross multiply
    19,379.20x = 29,020.20 × 12,769.60
  4. Step 4: Simplify right side
    19,379.20x = 370,576,345.92
  5. Step 5: Solve for x
    x = 370,576,345.92/19,379.20
  6. Step 6: Final answer
    x = 19,122.38

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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.