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Finding the Fourth Proportional to 386,912.70, 580,369.05 and 120,672.79

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Solution

The fourth proportional to 386,912.70, 580,369.05 and 120,672.79 is: 181,009.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,912.70 : 580,369.05 = 120,672.79 : x
  2. Step 2: Convert to fraction form
    386,912.70/580,369.05 = 120,672.79/x
  3. Step 3: Cross multiply
    386,912.70x = 580,369.05 × 120,672.79
  4. Step 4: Simplify right side
    386,912.70x = 70,034,751,042.23
  5. Step 5: Solve for x
    x = 70,034,751,042.23/386,912.70
  6. Step 6: Final answer
    x = 181,009.18

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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.