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Finding the Fourth Proportional to 3,988.89, 5,982.12 and 1,907.80

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Solution

The fourth proportional to 3,988.89, 5,982.12 and 1,907.80 is: 2,861.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,988.89 : 5,982.12 = 1,907.80 : x
  2. Step 2: Convert to fraction form
    3,988.89/5,982.12 = 1,907.80/x
  3. Step 3: Cross multiply
    3,988.89x = 5,982.12 × 1,907.80
  4. Step 4: Simplify right side
    3,988.89x = 11,412,673.58
  5. Step 5: Solve for x
    x = 11,412,673.58/3,988.89
  6. Step 6: Final answer
    x = 2,861.12

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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.