Home / 7,989.90-11,977.47-4,085.70

Finding the Fourth Proportional to 7,989.90, 11,977.47 and 4,085.70

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Solution

The fourth proportional to 7,989.90, 11,977.47 and 4,085.70 is: 6,124.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,989.90 : 11,977.47 = 4,085.70 : x
  2. Step 2: Convert to fraction form
    7,989.90/11,977.47 = 4,085.70/x
  3. Step 3: Cross multiply
    7,989.90x = 11,977.47 × 4,085.70
  4. Step 4: Simplify right side
    7,989.90x = 48,936,349.18
  5. Step 5: Solve for x
    x = 48,936,349.18/7,989.90
  6. Step 6: Final answer
    x = 6,124.78

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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.