Home / 20,800.22-28,707.28-12,309.80

Finding the Fourth Proportional to 20,800.22, 28,707.28 and 12,309.80

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Solution

The fourth proportional to 20,800.22, 28,707.28 and 12,309.80 is: 16,989.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,800.22 : 28,707.28 = 12,309.80 : x
  2. Step 2: Convert to fraction form
    20,800.22/28,707.28 = 12,309.80/x
  3. Step 3: Cross multiply
    20,800.22x = 28,707.28 × 12,309.80
  4. Step 4: Simplify right side
    20,800.22x = 353,380,701.03
  5. Step 5: Solve for x
    x = 353,380,701.03/20,800.22
  6. Step 6: Final answer
    x = 16,989.28

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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.