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Finding the Fourth Proportional to 71,409.87, 107,120.07 and 18,819

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Solution

The fourth proportional to 71,409.87, 107,120.07 and 18,819 is: 28,229.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,409.87 : 107,120.07 = 18,819 : x
  2. Step 2: Convert to fraction form
    71,409.87/107,120.07 = 18,819/x
  3. Step 3: Cross multiply
    71,409.87x = 107,120.07 × 18,819
  4. Step 4: Simplify right side
    71,409.87x = 2,015,892,597.33
  5. Step 5: Solve for x
    x = 2,015,892,597.33/71,409.87
  6. Step 6: Final answer
    x = 28,229.89

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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.