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Finding the Fourth Proportional to 259,693.20, 389,539.80 and 72,704.70

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Solution

The fourth proportional to 259,693.20, 389,539.80 and 72,704.70 is: 109,057.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,693.20 : 389,539.80 = 72,704.70 : x
  2. Step 2: Convert to fraction form
    259,693.20/389,539.80 = 72,704.70/x
  3. Step 3: Cross multiply
    259,693.20x = 389,539.80 × 72,704.70
  4. Step 4: Simplify right side
    259,693.20x = 28,321,374,297.06
  5. Step 5: Solve for x
    x = 28,321,374,297.06/259,693.20
  6. Step 6: Final answer
    x = 109,057.05

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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.