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Finding the Fourth Proportional to 18,389.80, 27,584.70 and 13,724.20

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Solution

The fourth proportional to 18,389.80, 27,584.70 and 13,724.20 is: 20,586.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,389.80 : 27,584.70 = 13,724.20 : x
  2. Step 2: Convert to fraction form
    18,389.80/27,584.70 = 13,724.20/x
  3. Step 3: Cross multiply
    18,389.80x = 27,584.70 × 13,724.20
  4. Step 4: Simplify right side
    18,389.80x = 378,577,939.74
  5. Step 5: Solve for x
    x = 378,577,939.74/18,389.80
  6. Step 6: Final answer
    x = 20,586.30

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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.