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Finding the Fourth Proportional to 14,471.20, 21,706.80 and 12,138.40

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Solution

The fourth proportional to 14,471.20, 21,706.80 and 12,138.40 is: 18,207.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,471.20 : 21,706.80 = 12,138.40 : x
  2. Step 2: Convert to fraction form
    14,471.20/21,706.80 = 12,138.40/x
  3. Step 3: Cross multiply
    14,471.20x = 21,706.80 × 12,138.40
  4. Step 4: Simplify right side
    14,471.20x = 263,485,821.12
  5. Step 5: Solve for x
    x = 263,485,821.12/14,471.20
  6. Step 6: Final answer
    x = 18,207.60

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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.