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Finding the Fourth Proportional to 18,879.21, 28,318.89 and 5,731.70

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Solution

The fourth proportional to 18,879.21, 28,318.89 and 5,731.70 is: 8,597.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,879.21 : 28,318.89 = 5,731.70 : x
  2. Step 2: Convert to fraction form
    18,879.21/28,318.89 = 5,731.70/x
  3. Step 3: Cross multiply
    18,879.21x = 28,318.89 × 5,731.70
  4. Step 4: Simplify right side
    18,879.21x = 162,315,240.22
  5. Step 5: Solve for x
    x = 162,315,240.22/18,879.21
  6. Step 6: Final answer
    x = 8,597.57

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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.