Home / 7,821.90-11,731.77-4,122.90

Finding the Fourth Proportional to 7,821.90, 11,731.77 and 4,122.90

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Solution

The fourth proportional to 7,821.90, 11,731.77 and 4,122.90 is: 6,183.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,821.90 : 11,731.77 = 4,122.90 : x
  2. Step 2: Convert to fraction form
    7,821.90/11,731.77 = 4,122.90/x
  3. Step 3: Cross multiply
    7,821.90x = 11,731.77 × 4,122.90
  4. Step 4: Simplify right side
    7,821.90x = 48,368,914.53
  5. Step 5: Solve for x
    x = 48,368,914.53/7,821.90
  6. Step 6: Final answer
    x = 6,183.78

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1.5x scale

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.