Home / 428,104.95-641,709.09-143,725.70

Finding the Fourth Proportional to 428,104.95, 641,709.09 and 143,725.70

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Solution

The fourth proportional to 428,104.95, 641,709.09 and 143,725.70 is: 215,438.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,104.95 : 641,709.09 = 143,725.70 : x
  2. Step 2: Convert to fraction form
    428,104.95/641,709.09 = 143,725.70/x
  3. Step 3: Cross multiply
    428,104.95x = 641,709.09 × 143,725.70
  4. Step 4: Simplify right side
    428,104.95x = 92,230,084,948.07
  5. Step 5: Solve for x
    x = 92,230,084,948.07/428,104.95
  6. Step 6: Final answer
    x = 215,438.03

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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.