Home / 428,350.82-642,558.08-128,807.42

Finding the Fourth Proportional to 428,350.82, 642,558.08 and 128,807.42

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Solution

The fourth proportional to 428,350.82, 642,558.08 and 128,807.42 is: 193,220.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,350.82 : 642,558.08 = 128,807.42 : x
  2. Step 2: Convert to fraction form
    428,350.82/642,558.08 = 128,807.42/x
  3. Step 3: Cross multiply
    428,350.82x = 642,558.08 × 128,807.42
  4. Step 4: Simplify right side
    428,350.82x = 82,766,245,594.18
  5. Step 5: Solve for x
    x = 82,766,245,594.18/428,350.82
  6. Step 6: Final answer
    x = 193,220.70

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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.