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Finding the Fourth Proportional to 20,775.56, 28,671.38 and 13,696.88

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Solution

The fourth proportional to 20,775.56, 28,671.38 and 13,696.88 is: 18,902.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,775.56 : 28,671.38 = 13,696.88 : x
  2. Step 2: Convert to fraction form
    20,775.56/28,671.38 = 13,696.88/x
  3. Step 3: Cross multiply
    20,775.56x = 28,671.38 × 13,696.88
  4. Step 4: Simplify right side
    20,775.56x = 392,708,451.29
  5. Step 5: Solve for x
    x = 392,708,451.29/20,775.56
  6. Step 6: Final answer
    x = 18,902.42

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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.