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Finding the Fourth Proportional to 259,635.60, 389,487.12 and 91,143.84

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Solution

The fourth proportional to 259,635.60, 389,487.12 and 91,143.84 is: 136,727.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,635.60 : 389,487.12 = 91,143.84 : x
  2. Step 2: Convert to fraction form
    259,635.60/389,487.12 = 91,143.84/x
  3. Step 3: Cross multiply
    259,635.60x = 389,487.12 × 91,143.84
  4. Step 4: Simplify right side
    259,635.60x = 35,499,351,747.34
  5. Step 5: Solve for x
    x = 35,499,351,747.34/259,635.60
  6. Step 6: Final answer
    x = 136,727.60

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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.