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Finding the Fourth Proportional to 485,990.33, 728,639.62 and 186,217.43

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Solution

The fourth proportional to 485,990.33, 728,639.62 and 186,217.43 is: 279,193.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,990.33 : 728,639.62 = 186,217.43 : x
  2. Step 2: Convert to fraction form
    485,990.33/728,639.62 = 186,217.43/x
  3. Step 3: Cross multiply
    485,990.33x = 728,639.62 × 186,217.43
  4. Step 4: Simplify right side
    485,990.33x = 135,685,393,323.84
  5. Step 5: Solve for x
    x = 135,685,393,323.84/485,990.33
  6. Step 6: Final answer
    x = 279,193.61

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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.