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Finding the Fourth Proportional to 28,419.96, 39,205.11 and 21,693.90

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Solution

The fourth proportional to 28,419.96, 39,205.11 and 21,693.90 is: 29,926.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,419.96 : 39,205.11 = 21,693.90 : x
  2. Step 2: Convert to fraction form
    28,419.96/39,205.11 = 21,693.90/x
  3. Step 3: Cross multiply
    28,419.96x = 39,205.11 × 21,693.90
  4. Step 4: Simplify right side
    28,419.96x = 850,511,735.83
  5. Step 5: Solve for x
    x = 850,511,735.83/28,419.96
  6. Step 6: Final answer
    x = 29,926.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.