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Finding the Fourth Proportional to 28,568.70, 42,861.78 and 12,786.98

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Solution

The fourth proportional to 28,568.70, 42,861.78 and 12,786.98 is: 19,184.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,568.70 : 42,861.78 = 12,786.98 : x
  2. Step 2: Convert to fraction form
    28,568.70/42,861.78 = 12,786.98/x
  3. Step 3: Cross multiply
    28,568.70x = 42,861.78 × 12,786.98
  4. Step 4: Simplify right side
    28,568.70x = 548,072,509.32
  5. Step 5: Solve for x
    x = 548,072,509.32/28,568.70
  6. Step 6: Final answer
    x = 19,184.37

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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.