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Finding the Fourth Proportional to 428,469.60, 642,704.40 and 112,958.40

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Solution

The fourth proportional to 428,469.60, 642,704.40 and 112,958.40 is: 169,437.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,469.60 : 642,704.40 = 112,958.40 : x
  2. Step 2: Convert to fraction form
    428,469.60/642,704.40 = 112,958.40/x
  3. Step 3: Cross multiply
    428,469.60x = 642,704.40 × 112,958.40
  4. Step 4: Simplify right side
    428,469.60x = 72,598,860,696.96
  5. Step 5: Solve for x
    x = 72,598,860,696.96/428,469.60
  6. Step 6: Final answer
    x = 169,437.60

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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.