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Finding the Fourth Proportional to 81,392.74, 122,063.99 and 28,790.12

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Solution

The fourth proportional to 81,392.74, 122,063.99 and 28,790.12 is: 43,176.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,392.74 : 122,063.99 = 28,790.12 : x
  2. Step 2: Convert to fraction form
    81,392.74/122,063.99 = 28,790.12/x
  3. Step 3: Cross multiply
    81,392.74x = 122,063.99 × 28,790.12
  4. Step 4: Simplify right side
    81,392.74x = 3,514,236,775.83
  5. Step 5: Solve for x
    x = 3,514,236,775.83/81,392.74
  6. Step 6: Final answer
    x = 43,176.30

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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.