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Finding the Fourth Proportional to 20,800.28, 28,704.84 and 11,368.84

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Solution

The fourth proportional to 20,800.28, 28,704.84 and 11,368.84 is: 15,689.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,800.28 : 28,704.84 = 11,368.84 : x
  2. Step 2: Convert to fraction form
    20,800.28/28,704.84 = 11,368.84/x
  3. Step 3: Cross multiply
    20,800.28x = 28,704.84 × 11,368.84
  4. Step 4: Simplify right side
    20,800.28x = 326,340,733.19
  5. Step 5: Solve for x
    x = 326,340,733.19/20,800.28
  6. Step 6: Final answer
    x = 15,689.25

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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.