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Finding the Fourth Proportional to 428,333.85, 642,502.22 and 108,485.60

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Solution

The fourth proportional to 428,333.85, 642,502.22 and 108,485.60 is: 162,728.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,333.85 : 642,502.22 = 108,485.60 : x
  2. Step 2: Convert to fraction form
    428,333.85/642,502.22 = 108,485.60/x
  3. Step 3: Cross multiply
    428,333.85x = 642,502.22 × 108,485.60
  4. Step 4: Simplify right side
    428,333.85x = 69,702,235,083.09
  5. Step 5: Solve for x
    x = 69,702,235,083.09/428,333.85
  6. Step 6: Final answer
    x = 162,728.76

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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.