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Finding the Fourth Proportional to 18,879.78, 28,308.64 and 7,773.94

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Solution

The fourth proportional to 18,879.78, 28,308.64 and 7,773.94 is: 11,656.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,879.78 : 28,308.64 = 7,773.94 : x
  2. Step 2: Convert to fraction form
    18,879.78/28,308.64 = 7,773.94/x
  3. Step 3: Cross multiply
    18,879.78x = 28,308.64 × 7,773.94
  4. Step 4: Simplify right side
    18,879.78x = 220,069,668.84
  5. Step 5: Solve for x
    x = 220,069,668.84/18,879.78
  6. Step 6: Final answer
    x = 11,656.37

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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.