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Finding the Fourth Proportional to 18,919.26, 28,349.58 and 12,998.97

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Solution

The fourth proportional to 18,919.26, 28,349.58 and 12,998.97 is: 19,478.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.26 : 28,349.58 = 12,998.97 : x
  2. Step 2: Convert to fraction form
    18,919.26/28,349.58 = 12,998.97/x
  3. Step 3: Cross multiply
    18,919.26x = 28,349.58 × 12,998.97
  4. Step 4: Simplify right side
    18,919.26x = 368,515,339.93
  5. Step 5: Solve for x
    x = 368,515,339.93/18,919.26
  6. Step 6: Final answer
    x = 19,478.32

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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.