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Finding the Fourth Proportional to 81,874.80, 122,790.60 and 25,714.80

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Solution

The fourth proportional to 81,874.80, 122,790.60 and 25,714.80 is: 38,565.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,874.80 : 122,790.60 = 25,714.80 : x
  2. Step 2: Convert to fraction form
    81,874.80/122,790.60 = 25,714.80/x
  3. Step 3: Cross multiply
    81,874.80x = 122,790.60 × 25,714.80
  4. Step 4: Simplify right side
    81,874.80x = 3,157,535,720.88
  5. Step 5: Solve for x
    x = 3,157,535,720.88/81,874.80
  6. Step 6: Final answer
    x = 38,565.42

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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.