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Finding the Fourth Proportional to 428,265.40, 641,730.90 and 161,880.60

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Solution

The fourth proportional to 428,265.40, 641,730.90 and 161,880.60 is: 242,568.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,265.40 : 641,730.90 = 161,880.60 : x
  2. Step 2: Convert to fraction form
    428,265.40/641,730.90 = 161,880.60/x
  3. Step 3: Cross multiply
    428,265.40x = 641,730.90 × 161,880.60
  4. Step 4: Simplify right side
    428,265.40x = 103,883,783,130.54
  5. Step 5: Solve for x
    x = 103,883,783,130.54/428,265.40
  6. Step 6: Final answer
    x = 242,568.70

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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.