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Finding the Fourth Proportional to 20,365.88, 30,558 and 12,968.42

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Solution

The fourth proportional to 20,365.88, 30,558 and 12,968.42 is: 19,458.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,365.88 : 30,558 = 12,968.42 : x
  2. Step 2: Convert to fraction form
    20,365.88/30,558 = 12,968.42/x
  3. Step 3: Cross multiply
    20,365.88x = 30,558 × 12,968.42
  4. Step 4: Simplify right side
    20,365.88x = 396,288,978.36
  5. Step 5: Solve for x
    x = 396,288,978.36/20,365.88
  6. Step 6: Final answer
    x = 19,458.48

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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.