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Finding the Fourth Proportional to 18,991.98, 28,487.84 and 7,747.28

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Solution

The fourth proportional to 18,991.98, 28,487.84 and 7,747.28 is: 11,620.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.98 : 28,487.84 = 7,747.28 : x
  2. Step 2: Convert to fraction form
    18,991.98/28,487.84 = 7,747.28/x
  3. Step 3: Cross multiply
    18,991.98x = 28,487.84 × 7,747.28
  4. Step 4: Simplify right side
    18,991.98x = 220,703,273.08
  5. Step 5: Solve for x
    x = 220,703,273.08/18,991.98
  6. Step 6: Final answer
    x = 11,620.87

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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.