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Finding the Fourth Proportional to 45,879.68, 68,812.16 and 12,591.98

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Solution

The fourth proportional to 45,879.68, 68,812.16 and 12,591.98 is: 18,885.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,879.68 : 68,812.16 = 12,591.98 : x
  2. Step 2: Convert to fraction form
    45,879.68/68,812.16 = 12,591.98/x
  3. Step 3: Cross multiply
    45,879.68x = 68,812.16 × 12,591.98
  4. Step 4: Simplify right side
    45,879.68x = 866,481,342.48
  5. Step 5: Solve for x
    x = 866,481,342.48/45,879.68
  6. Step 6: Final answer
    x = 18,885.95

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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.