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Finding the Fourth Proportional to 13,791.68, 20,682.87 and 4,429.40

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Solution

The fourth proportional to 13,791.68, 20,682.87 and 4,429.40 is: 6,642.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,791.68 : 20,682.87 = 4,429.40 : x
  2. Step 2: Convert to fraction form
    13,791.68/20,682.87 = 4,429.40/x
  3. Step 3: Cross multiply
    13,791.68x = 20,682.87 × 4,429.40
  4. Step 4: Simplify right side
    13,791.68x = 91,612,600.96
  5. Step 5: Solve for x
    x = 91,612,600.96/13,791.68
  6. Step 6: Final answer
    x = 6,642.60

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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.