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Finding the Fourth Proportional to 485,796.12, 728,639.46 and 130,836.12

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Solution

The fourth proportional to 485,796.12, 728,639.46 and 130,836.12 is: 196,239.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,796.12 : 728,639.46 = 130,836.12 : x
  2. Step 2: Convert to fraction form
    485,796.12/728,639.46 = 130,836.12/x
  3. Step 3: Cross multiply
    485,796.12x = 728,639.46 × 130,836.12
  4. Step 4: Simplify right side
    485,796.12x = 95,332,359,825.30
  5. Step 5: Solve for x
    x = 95,332,359,825.30/485,796.12
  6. Step 6: Final answer
    x = 196,239.44

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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.