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Finding the Fourth Proportional to 18,343.80, 27,515.70 and 12,814.20

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Solution

The fourth proportional to 18,343.80, 27,515.70 and 12,814.20 is: 19,221.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,343.80 : 27,515.70 = 12,814.20 : x
  2. Step 2: Convert to fraction form
    18,343.80/27,515.70 = 12,814.20/x
  3. Step 3: Cross multiply
    18,343.80x = 27,515.70 × 12,814.20
  4. Step 4: Simplify right side
    18,343.80x = 352,591,682.94
  5. Step 5: Solve for x
    x = 352,591,682.94/18,343.80
  6. Step 6: Final answer
    x = 19,221.30

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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.