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Finding the Fourth Proportional to 12,571.75, 18,860.05 and 4,779.95

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Solution

The fourth proportional to 12,571.75, 18,860.05 and 4,779.95 is: 7,170.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,571.75 : 18,860.05 = 4,779.95 : x
  2. Step 2: Convert to fraction form
    12,571.75/18,860.05 = 4,779.95/x
  3. Step 3: Cross multiply
    12,571.75x = 18,860.05 × 4,779.95
  4. Step 4: Simplify right side
    12,571.75x = 90,150,096.00
  5. Step 5: Solve for x
    x = 90,150,096.00/12,571.75
  6. Step 6: Final answer
    x = 7,170.85

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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.