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Finding the Fourth Proportional to 259,719.70, 389,530.35 and 91,200.43

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Solution

The fourth proportional to 259,719.70, 389,530.35 and 91,200.43 is: 136,783.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,719.70 : 389,530.35 = 91,200.43 : x
  2. Step 2: Convert to fraction form
    259,719.70/389,530.35 = 91,200.43/x
  3. Step 3: Cross multiply
    259,719.70x = 389,530.35 × 91,200.43
  4. Step 4: Simplify right side
    259,719.70x = 35,525,335,418.05
  5. Step 5: Solve for x
    x = 35,525,335,418.05/259,719.70
  6. Step 6: Final answer
    x = 136,783.37

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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.