Home / 12,321.75-18,478.71-3,999.84

Finding the Fourth Proportional to 12,321.75, 18,478.71 and 3,999.84

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Solution

The fourth proportional to 12,321.75, 18,478.71 and 3,999.84 is: 5,998.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,321.75 : 18,478.71 = 3,999.84 : x
  2. Step 2: Convert to fraction form
    12,321.75/18,478.71 = 3,999.84/x
  3. Step 3: Cross multiply
    12,321.75x = 18,478.71 × 3,999.84
  4. Step 4: Simplify right side
    12,321.75x = 73,911,883.41
  5. Step 5: Solve for x
    x = 73,911,883.41/12,321.75
  6. Step 6: Final answer
    x = 5,998.49

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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.