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Finding the Fourth Proportional to 18,998.19, 28,481.91 and 7,913.18

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Solution

The fourth proportional to 18,998.19, 28,481.91 and 7,913.18 is: 11,863.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,998.19 : 28,481.91 = 7,913.18 : x
  2. Step 2: Convert to fraction form
    18,998.19/28,481.91 = 7,913.18/x
  3. Step 3: Cross multiply
    18,998.19x = 28,481.91 × 7,913.18
  4. Step 4: Simplify right side
    18,998.19x = 225,382,480.57
  5. Step 5: Solve for x
    x = 225,382,480.57/18,998.19
  6. Step 6: Final answer
    x = 11,863.37

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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.