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Finding the Fourth Proportional to 19,995.20, 29,960.40 and 12,586.40

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Solution

The fourth proportional to 19,995.20, 29,960.40 and 12,586.40 is: 18,859.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,995.20 : 29,960.40 = 12,586.40 : x
  2. Step 2: Convert to fraction form
    19,995.20/29,960.40 = 12,586.40/x
  3. Step 3: Cross multiply
    19,995.20x = 29,960.40 × 12,586.40
  4. Step 4: Simplify right side
    19,995.20x = 377,093,578.56
  5. Step 5: Solve for x
    x = 377,093,578.56/19,995.20
  6. Step 6: Final answer
    x = 18,859.21

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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.