Home / 428,143.28-642,190.20-128,617.28

Finding the Fourth Proportional to 428,143.28, 642,190.20 and 128,617.28

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Solution

The fourth proportional to 428,143.28, 642,190.20 and 128,617.28 is: 192,918.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,143.28 : 642,190.20 = 128,617.28 : x
  2. Step 2: Convert to fraction form
    428,143.28/642,190.20 = 128,617.28/x
  3. Step 3: Cross multiply
    428,143.28x = 642,190.20 × 128,617.28
  4. Step 4: Simplify right side
    428,143.28x = 82,596,756,766.66
  5. Step 5: Solve for x
    x = 82,596,756,766.66/428,143.28
  6. Step 6: Final answer
    x = 192,918.49

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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.