Home / 428,435.55-642,523.79-128,836.60

Finding the Fourth Proportional to 428,435.55, 642,523.79 and 128,836.60

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Solution

The fourth proportional to 428,435.55, 642,523.79 and 128,836.60 is: 193,215.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,435.55 : 642,523.79 = 128,836.60 : x
  2. Step 2: Convert to fraction form
    428,435.55/642,523.79 = 128,836.60/x
  3. Step 3: Cross multiply
    428,435.55x = 642,523.79 × 128,836.60
  4. Step 4: Simplify right side
    428,435.55x = 82,780,579,238.50
  5. Step 5: Solve for x
    x = 82,780,579,238.50/428,435.55
  6. Step 6: Final answer
    x = 193,215.94

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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.