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Finding the Fourth Proportional to 20,671, 31,006.56 and 6,821.08

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Solution

The fourth proportional to 20,671, 31,006.56 and 6,821.08 is: 10,231.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,671 : 31,006.56 = 6,821.08 : x
  2. Step 2: Convert to fraction form
    20,671/31,006.56 = 6,821.08/x
  3. Step 3: Cross multiply
    20,671x = 31,006.56 × 6,821.08
  4. Step 4: Simplify right side
    20,671x = 211,498,226.28
  5. Step 5: Solve for x
    x = 211,498,226.28/20,671
  6. Step 6: Final answer
    x = 10,231.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.