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Finding the Fourth Proportional to 71,911.86, 107,866.87 and 21,993.58

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Solution

The fourth proportional to 71,911.86, 107,866.87 and 21,993.58 is: 32,990.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,911.86 : 107,866.87 = 21,993.58 : x
  2. Step 2: Convert to fraction form
    71,911.86/107,866.87 = 21,993.58/x
  3. Step 3: Cross multiply
    71,911.86x = 107,866.87 × 21,993.58
  4. Step 4: Simplify right side
    71,911.86x = 2,372,378,634.69
  5. Step 5: Solve for x
    x = 2,372,378,634.69/71,911.86
  6. Step 6: Final answer
    x = 32,990.09

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1.5x scale

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.