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Finding the Fourth Proportional to 3,907.99, 5,387.42 and 2,786.99

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Solution

The fourth proportional to 3,907.99, 5,387.42 and 2,786.99 is: 3,842.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,907.99 : 5,387.42 = 2,786.99 : x
  2. Step 2: Convert to fraction form
    3,907.99/5,387.42 = 2,786.99/x
  3. Step 3: Cross multiply
    3,907.99x = 5,387.42 × 2,786.99
  4. Step 4: Simplify right side
    3,907.99x = 15,014,685.67
  5. Step 5: Solve for x
    x = 15,014,685.67/3,907.99
  6. Step 6: Final answer
    x = 3,842.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.