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Finding the Fourth Proportional to 393,971.29, 547,350.79 and 389,247.37

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Solution

The fourth proportional to 393,971.29, 547,350.79 and 389,247.37 is: 540,787.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,971.29 : 547,350.79 = 389,247.37 : x
  2. Step 2: Convert to fraction form
    393,971.29/547,350.79 = 389,247.37/x
  3. Step 3: Cross multiply
    393,971.29x = 547,350.79 × 389,247.37
  4. Step 4: Simplify right side
    393,971.29x = 213,054,858,036.87
  5. Step 5: Solve for x
    x = 213,054,858,036.87/393,971.29
  6. Step 6: Final answer
    x = 540,787.77

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.