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Finding the Fourth Proportional to 18,523.80, 27,785.70 and 12,648.60

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Solution

The fourth proportional to 18,523.80, 27,785.70 and 12,648.60 is: 18,972.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,523.80 : 27,785.70 = 12,648.60 : x
  2. Step 2: Convert to fraction form
    18,523.80/27,785.70 = 12,648.60/x
  3. Step 3: Cross multiply
    18,523.80x = 27,785.70 × 12,648.60
  4. Step 4: Simplify right side
    18,523.80x = 351,450,205.02
  5. Step 5: Solve for x
    x = 351,450,205.02/18,523.80
  6. Step 6: Final answer
    x = 18,972.90

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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.