Home / 428,928.21-643,183.88-129,352.95

Finding the Fourth Proportional to 428,928.21, 643,183.88 and 129,352.95

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Solution

The fourth proportional to 428,928.21, 643,183.88 and 129,352.95 is: 193,966.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,928.21 : 643,183.88 = 129,352.95 : x
  2. Step 2: Convert to fraction form
    428,928.21/643,183.88 = 129,352.95/x
  3. Step 3: Cross multiply
    428,928.21x = 643,183.88 × 129,352.95
  4. Step 4: Simplify right side
    428,928.21x = 83,197,731,623.68
  5. Step 5: Solve for x
    x = 83,197,731,623.68/428,928.21
  6. Step 6: Final answer
    x = 193,966.57

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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.