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Finding the Fourth Proportional to 61,321.40, 91,982.10 and 21,879.80

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Solution

The fourth proportional to 61,321.40, 91,982.10 and 21,879.80 is: 32,819.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,321.40 : 91,982.10 = 21,879.80 : x
  2. Step 2: Convert to fraction form
    61,321.40/91,982.10 = 21,879.80/x
  3. Step 3: Cross multiply
    61,321.40x = 91,982.10 × 21,879.80
  4. Step 4: Simplify right side
    61,321.40x = 2,012,549,951.58
  5. Step 5: Solve for x
    x = 2,012,549,951.58/61,321.40
  6. Step 6: Final answer
    x = 32,819.70

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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.