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Finding the Fourth Proportional to 259,751.28, 389,313.40 and 126,431.76

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Solution

The fourth proportional to 259,751.28, 389,313.40 and 126,431.76 is: 189,495.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,751.28 : 389,313.40 = 126,431.76 : x
  2. Step 2: Convert to fraction form
    259,751.28/389,313.40 = 126,431.76/x
  3. Step 3: Cross multiply
    259,751.28x = 389,313.40 × 126,431.76
  4. Step 4: Simplify right side
    259,751.28x = 49,221,578,353.58
  5. Step 5: Solve for x
    x = 49,221,578,353.58/259,751.28
  6. Step 6: Final answer
    x = 189,495.04

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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.