Home / 428,105.95-641,710.59-143,726.70

Finding the Fourth Proportional to 428,105.95, 641,710.59 and 143,726.70

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Solution

The fourth proportional to 428,105.95, 641,710.59 and 143,726.70 is: 215,439.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,105.95 : 641,710.59 = 143,726.70 : x
  2. Step 2: Convert to fraction form
    428,105.95/641,710.59 = 143,726.70/x
  3. Step 3: Cross multiply
    428,105.95x = 641,710.59 × 143,726.70
  4. Step 4: Simplify right side
    428,105.95x = 92,230,945,455.75
  5. Step 5: Solve for x
    x = 92,230,945,455.75/428,105.95
  6. Step 6: Final answer
    x = 215,439.53

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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.