Home / 20,742.91-28,628-13,189.99

Finding the Fourth Proportional to 20,742.91, 28,628 and 13,189.99

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Solution

The fourth proportional to 20,742.91, 28,628 and 13,189.99 is: 18,203.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,742.91 : 28,628 = 13,189.99 : x
  2. Step 2: Convert to fraction form
    20,742.91/28,628 = 13,189.99/x
  3. Step 3: Cross multiply
    20,742.91x = 28,628 × 13,189.99
  4. Step 4: Simplify right side
    20,742.91x = 377,603,033.72
  5. Step 5: Solve for x
    x = 377,603,033.72/20,742.91
  6. Step 6: Final answer
    x = 18,203.96

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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.