Home / 20,860.78-31,298.15-6,821.45

Finding the Fourth Proportional to 20,860.78, 31,298.15 and 6,821.45

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Solution

The fourth proportional to 20,860.78, 31,298.15 and 6,821.45 is: 10,234.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,860.78 : 31,298.15 = 6,821.45 : x
  2. Step 2: Convert to fraction form
    20,860.78/31,298.15 = 6,821.45/x
  3. Step 3: Cross multiply
    20,860.78x = 31,298.15 × 6,821.45
  4. Step 4: Simplify right side
    20,860.78x = 213,498,804.44
  5. Step 5: Solve for x
    x = 213,498,804.44/20,860.78
  6. Step 6: Final answer
    x = 10,234.46

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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.