Home / 18,678.21-28,021.41-5,531.61

Finding the Fourth Proportional to 18,678.21, 28,021.41 and 5,531.61

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Solution

The fourth proportional to 18,678.21, 28,021.41 and 5,531.61 is: 8,298.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,678.21 : 28,021.41 = 5,531.61 : x
  2. Step 2: Convert to fraction form
    18,678.21/28,021.41 = 5,531.61/x
  3. Step 3: Cross multiply
    18,678.21x = 28,021.41 × 5,531.61
  4. Step 4: Simplify right side
    18,678.21x = 155,003,511.77
  5. Step 5: Solve for x
    x = 155,003,511.77/18,678.21
  6. Step 6: Final answer
    x = 8,298.63

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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.