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Finding the Fourth Proportional to 428,383.32, 641,873.98 and 259,391.80

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Solution

The fourth proportional to 428,383.32, 641,873.98 and 259,391.80 is: 388,663.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,383.32 : 641,873.98 = 259,391.80 : x
  2. Step 2: Convert to fraction form
    428,383.32/641,873.98 = 259,391.80/x
  3. Step 3: Cross multiply
    428,383.32x = 641,873.98 × 259,391.80
  4. Step 4: Simplify right side
    428,383.32x = 166,496,847,045.36
  5. Step 5: Solve for x
    x = 166,496,847,045.36/428,383.32
  6. Step 6: Final answer
    x = 388,663.24

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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.