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Finding the Fourth Proportional to 18,998.70, 28,503.30 and 7,910.60

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Solution

The fourth proportional to 18,998.70, 28,503.30 and 7,910.60 is: 11,868.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,998.70 : 28,503.30 = 7,910.60 : x
  2. Step 2: Convert to fraction form
    18,998.70/28,503.30 = 7,910.60/x
  3. Step 3: Cross multiply
    18,998.70x = 28,503.30 × 7,910.60
  4. Step 4: Simplify right side
    18,998.70x = 225,478,204.98
  5. Step 5: Solve for x
    x = 225,478,204.98/18,998.70
  6. Step 6: Final answer
    x = 11,868.09

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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.