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Finding the Fourth Proportional to 3,907.40, 5,861.07 and 985.69

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Solution

The fourth proportional to 3,907.40, 5,861.07 and 985.69 is: 1,478.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,907.40 : 5,861.07 = 985.69 : x
  2. Step 2: Convert to fraction form
    3,907.40/5,861.07 = 985.69/x
  3. Step 3: Cross multiply
    3,907.40x = 5,861.07 × 985.69
  4. Step 4: Simplify right side
    3,907.40x = 5,777,183.44
  5. Step 5: Solve for x
    x = 5,777,183.44/3,907.40
  6. Step 6: Final answer
    x = 1,478.53

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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.