Home / 428,976.47-643,469.30-129,459.73

Finding the Fourth Proportional to 428,976.47, 643,469.30 and 129,459.73

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Solution

The fourth proportional to 428,976.47, 643,469.30 and 129,459.73 is: 194,190.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,976.47 : 643,469.30 = 129,459.73 : x
  2. Step 2: Convert to fraction form
    428,976.47/643,469.30 = 129,459.73/x
  3. Step 3: Cross multiply
    428,976.47x = 643,469.30 × 129,459.73
  4. Step 4: Simplify right side
    428,976.47x = 83,303,361,841.29
  5. Step 5: Solve for x
    x = 83,303,361,841.29/428,976.47
  6. Step 6: Final answer
    x = 194,190.98

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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.