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Finding the Fourth Proportional to 485,639.28, 728,043.50 and 186,334.66

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Solution

The fourth proportional to 485,639.28, 728,043.50 and 186,334.66 is: 279,342.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,639.28 : 728,043.50 = 186,334.66 : x
  2. Step 2: Convert to fraction form
    485,639.28/728,043.50 = 186,334.66/x
  3. Step 3: Cross multiply
    485,639.28x = 728,043.50 × 186,334.66
  4. Step 4: Simplify right side
    485,639.28x = 135,659,739,413.60
  5. Step 5: Solve for x
    x = 135,659,739,413.60/485,639.28
  6. Step 6: Final answer
    x = 279,342.60

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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.