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Finding the Fourth Proportional to 18,789.26, 28,186.64 and 5,642.67

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Solution

The fourth proportional to 18,789.26, 28,186.64 and 5,642.67 is: 8,464.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,789.26 : 28,186.64 = 5,642.67 : x
  2. Step 2: Convert to fraction form
    18,789.26/28,186.64 = 5,642.67/x
  3. Step 3: Cross multiply
    18,789.26x = 28,186.64 × 5,642.67
  4. Step 4: Simplify right side
    18,789.26x = 159,047,879.72
  5. Step 5: Solve for x
    x = 159,047,879.72/18,789.26
  6. Step 6: Final answer
    x = 8,464.83

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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.