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Finding the Fourth Proportional to 18,471.20, 27,706.80 and 12,930.80

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Solution

The fourth proportional to 18,471.20, 27,706.80 and 12,930.80 is: 19,396.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,471.20 : 27,706.80 = 12,930.80 : x
  2. Step 2: Convert to fraction form
    18,471.20/27,706.80 = 12,930.80/x
  3. Step 3: Cross multiply
    18,471.20x = 27,706.80 × 12,930.80
  4. Step 4: Simplify right side
    18,471.20x = 358,271,089.44
  5. Step 5: Solve for x
    x = 358,271,089.44/18,471.20
  6. Step 6: Final answer
    x = 19,396.20

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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.