Home / 428,718.40-642,912.84-203,905.60

Finding the Fourth Proportional to 428,718.40, 642,912.84 and 203,905.60

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Solution

The fourth proportional to 428,718.40, 642,912.84 and 203,905.60 is: 305,780.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,718.40 : 642,912.84 = 203,905.60 : x
  2. Step 2: Convert to fraction form
    428,718.40/642,912.84 = 203,905.60/x
  3. Step 3: Cross multiply
    428,718.40x = 642,912.84 × 203,905.60
  4. Step 4: Simplify right side
    428,718.40x = 131,093,528,387.90
  5. Step 5: Solve for x
    x = 131,093,528,387.90/428,718.40
  6. Step 6: Final answer
    x = 305,780.04

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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.