Home / 428,991.27-643,491.17-129,474.33

Finding the Fourth Proportional to 428,991.27, 643,491.17 and 129,474.33

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Solution

The fourth proportional to 428,991.27, 643,491.17 and 129,474.33 is: 194,212.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,991.27 : 643,491.17 = 129,474.33 : x
  2. Step 2: Convert to fraction form
    428,991.27/643,491.17 = 129,474.33/x
  3. Step 3: Cross multiply
    428,991.27x = 643,491.17 × 129,474.33
  4. Step 4: Simplify right side
    428,991.27x = 83,315,587,449.29
  5. Step 5: Solve for x
    x = 83,315,587,449.29/428,991.27
  6. Step 6: Final answer
    x = 194,212.78

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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.