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Finding the Fourth Proportional to 19,963.20, 29,912.40 and 12,554.40

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Solution

The fourth proportional to 19,963.20, 29,912.40 and 12,554.40 is: 18,811.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,963.20 : 29,912.40 = 12,554.40 : x
  2. Step 2: Convert to fraction form
    19,963.20/29,912.40 = 12,554.40/x
  3. Step 3: Cross multiply
    19,963.20x = 29,912.40 × 12,554.40
  4. Step 4: Simplify right side
    19,963.20x = 375,532,234.56
  5. Step 5: Solve for x
    x = 375,532,234.56/19,963.20
  6. Step 6: Final answer
    x = 18,811.22

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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.