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Finding the Fourth Proportional to 12,156, 18,234.90 and 4,759.80

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Solution

The fourth proportional to 12,156, 18,234.90 and 4,759.80 is: 7,140.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,156 : 18,234.90 = 4,759.80 : x
  2. Step 2: Convert to fraction form
    12,156/18,234.90 = 4,759.80/x
  3. Step 3: Cross multiply
    12,156x = 18,234.90 × 4,759.80
  4. Step 4: Simplify right side
    12,156x = 86,794,477.02
  5. Step 5: Solve for x
    x = 86,794,477.02/12,156
  6. Step 6: Final answer
    x = 7,140.05

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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.