Home / 428,640.27-642,995.46-215,298.48

Finding the Fourth Proportional to 428,640.27, 642,995.46 and 215,298.48

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Solution

The fourth proportional to 428,640.27, 642,995.46 and 215,298.48 is: 322,965.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,640.27 : 642,995.46 = 215,298.48 : x
  2. Step 2: Convert to fraction form
    428,640.27/642,995.46 = 215,298.48/x
  3. Step 3: Cross multiply
    428,640.27x = 642,995.46 × 215,298.48
  4. Step 4: Simplify right side
    428,640.27x = 138,435,945,184.90
  5. Step 5: Solve for x
    x = 138,435,945,184.90/428,640.27
  6. Step 6: Final answer
    x = 322,965.33

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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.