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Finding the Fourth Proportional to 6,289.71, 8,679.84 and 3,933.21

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Solution

The fourth proportional to 6,289.71, 8,679.84 and 3,933.21 is: 5,427.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,289.71 : 8,679.84 = 3,933.21 : x
  2. Step 2: Convert to fraction form
    6,289.71/8,679.84 = 3,933.21/x
  3. Step 3: Cross multiply
    6,289.71x = 8,679.84 × 3,933.21
  4. Step 4: Simplify right side
    6,289.71x = 34,139,633.49
  5. Step 5: Solve for x
    x = 34,139,633.49/6,289.71
  6. Step 6: Final answer
    x = 5,427.85

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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.