Home / 428,318.36-642,025.44-143,739.09

Finding the Fourth Proportional to 428,318.36, 642,025.44 and 143,739.09

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Solution

The fourth proportional to 428,318.36, 642,025.44 and 143,739.09 is: 215,456.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,318.36 : 642,025.44 = 143,739.09 : x
  2. Step 2: Convert to fraction form
    428,318.36/642,025.44 = 143,739.09/x
  3. Step 3: Cross multiply
    428,318.36x = 642,025.44 × 143,739.09
  4. Step 4: Simplify right side
    428,318.36x = 92,284,152,502.45
  5. Step 5: Solve for x
    x = 92,284,152,502.45/428,318.36
  6. Step 6: Final answer
    x = 215,456.91

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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.