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Finding the Fourth Proportional to 18,978.62, 28,429.25 and 11,477.61

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Solution

The fourth proportional to 18,978.62, 28,429.25 and 11,477.61 is: 17,193.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.62 : 28,429.25 = 11,477.61 : x
  2. Step 2: Convert to fraction form
    18,978.62/28,429.25 = 11,477.61/x
  3. Step 3: Cross multiply
    18,978.62x = 28,429.25 × 11,477.61
  4. Step 4: Simplify right side
    18,978.62x = 326,299,786.70
  5. Step 5: Solve for x
    x = 326,299,786.70/18,978.62
  6. Step 6: Final answer
    x = 17,193.02

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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.