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Finding the Fourth Proportional to 20,800.72, 28,707.20 and 12,305.68

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Solution

The fourth proportional to 20,800.72, 28,707.20 and 12,305.68 is: 16,983.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,800.72 : 28,707.20 = 12,305.68 : x
  2. Step 2: Convert to fraction form
    20,800.72/28,707.20 = 12,305.68/x
  3. Step 3: Cross multiply
    20,800.72x = 28,707.20 × 12,305.68
  4. Step 4: Simplify right side
    20,800.72x = 353,261,616.90
  5. Step 5: Solve for x
    x = 353,261,616.90/20,800.72
  6. Step 6: Final answer
    x = 16,983.14

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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.