Home / 428,278,845.52-642,416,978.04-121,571,218

Finding the Fourth Proportional to 428,278,845.52, 642,416,978.04 and 121,571,218

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Solution

The fourth proportional to 428,278,845.52, 642,416,978.04 and 121,571,218 is: 182,356,460.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,278,845.52 : 642,416,978.04 = 121,571,218 : x
  2. Step 2: Convert to fraction form
    428,278,845.52/642,416,978.04 = 121,571,218/x
  3. Step 3: Cross multiply
    428,278,845.52x = 642,416,978.04 × 121,571,218
  4. Step 4: Simplify right side
    428,278,845.52x = 78,099,414,484,202,048
  5. Step 5: Solve for x
    x = 78,099,414,484,202,048/428,278,845.52
  6. Step 6: Final answer
    x = 182,356,460.75

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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.