Home / 20,707.89-28,578.20-11,751.99

Finding the Fourth Proportional to 20,707.89, 28,578.20 and 11,751.99

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Solution

The fourth proportional to 20,707.89, 28,578.20 and 11,751.99 is: 16,218.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,707.89 : 28,578.20 = 11,751.99 : x
  2. Step 2: Convert to fraction form
    20,707.89/28,578.20 = 11,751.99/x
  3. Step 3: Cross multiply
    20,707.89x = 28,578.20 × 11,751.99
  4. Step 4: Simplify right side
    20,707.89x = 335,850,661.86
  5. Step 5: Solve for x
    x = 335,850,661.86/20,707.89
  6. Step 6: Final answer
    x = 16,218.49

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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.