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Finding the Fourth Proportional to 18,087.70, 27,139.65 and 8,221.90

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Solution

The fourth proportional to 18,087.70, 27,139.65 and 8,221.90 is: 12,336.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,087.70 : 27,139.65 = 8,221.90 : x
  2. Step 2: Convert to fraction form
    18,087.70/27,139.65 = 8,221.90/x
  3. Step 3: Cross multiply
    18,087.70x = 27,139.65 × 8,221.90
  4. Step 4: Simplify right side
    18,087.70x = 223,139,488.34
  5. Step 5: Solve for x
    x = 223,139,488.34/18,087.70
  6. Step 6: Final answer
    x = 12,336.53

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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.