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Finding the Fourth Proportional to 485,661.30, 728,076.42 and 186,356.66

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Solution

The fourth proportional to 485,661.30, 728,076.42 and 186,356.66 is: 279,375.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,661.30 : 728,076.42 = 186,356.66 : x
  2. Step 2: Convert to fraction form
    485,661.30/728,076.42 = 186,356.66/x
  3. Step 3: Cross multiply
    485,661.30x = 728,076.42 × 186,356.66
  4. Step 4: Simplify right side
    485,661.30x = 135,681,889,855.96
  5. Step 5: Solve for x
    x = 135,681,889,855.96/485,661.30
  6. Step 6: Final answer
    x = 279,375.54

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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.