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Finding the Fourth Proportional to 20,800.12, 28,704.17 and 11,368.68

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Solution

The fourth proportional to 20,800.12, 28,704.17 and 11,368.68 is: 15,688.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,800.12 : 28,704.17 = 11,368.68 : x
  2. Step 2: Convert to fraction form
    20,800.12/28,704.17 = 11,368.68/x
  3. Step 3: Cross multiply
    20,800.12x = 28,704.17 × 11,368.68
  4. Step 4: Simplify right side
    20,800.12x = 326,328,523.40
  5. Step 5: Solve for x
    x = 326,328,523.40/20,800.12
  6. Step 6: Final answer
    x = 15,688.78

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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.