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Finding the Fourth Proportional to 428,099.28, 638,380.56 and 398,181.12

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Solution

The fourth proportional to 428,099.28, 638,380.56 and 398,181.12 is: 593,766.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,099.28 : 638,380.56 = 398,181.12 : x
  2. Step 2: Convert to fraction form
    428,099.28/638,380.56 = 398,181.12/x
  3. Step 3: Cross multiply
    428,099.28x = 638,380.56 × 398,181.12
  4. Step 4: Simplify right side
    428,099.28x = 254,191,086,367.03
  5. Step 5: Solve for x
    x = 254,191,086,367.03/428,099.28
  6. Step 6: Final answer
    x = 593,766.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.