Home / 428,182.18-642,287.85-203,426.62

Finding the Fourth Proportional to 428,182.18, 642,287.85 and 203,426.62

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Solution

The fourth proportional to 428,182.18, 642,287.85 and 203,426.62 is: 305,146.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,182.18 : 642,287.85 = 203,426.62 : x
  2. Step 2: Convert to fraction form
    428,182.18/642,287.85 = 203,426.62/x
  3. Step 3: Cross multiply
    428,182.18x = 642,287.85 × 203,426.62
  4. Step 4: Simplify right side
    428,182.18x = 130,658,446,392.57
  5. Step 5: Solve for x
    x = 130,658,446,392.57/428,182.18
  6. Step 6: Final answer
    x = 305,146.86

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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.