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Finding the Fourth Proportional to 386,728.26, 579,953.46 and 133,940.70

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Solution

The fourth proportional to 386,728.26, 579,953.46 and 133,940.70 is: 200,862.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,728.26 : 579,953.46 = 133,940.70 : x
  2. Step 2: Convert to fraction form
    386,728.26/579,953.46 = 133,940.70/x
  3. Step 3: Cross multiply
    386,728.26x = 579,953.46 × 133,940.70
  4. Step 4: Simplify right side
    386,728.26x = 77,679,372,399.82
  5. Step 5: Solve for x
    x = 77,679,372,399.82/386,728.26
  6. Step 6: Final answer
    x = 200,862.93

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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.