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Finding the Fourth Proportional to 393,978.20, 590,118.48 and 266,921.37

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Solution

The fourth proportional to 393,978.20, 590,118.48 and 266,921.37 is: 399,806.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,978.20 : 590,118.48 = 266,921.37 : x
  2. Step 2: Convert to fraction form
    393,978.20/590,118.48 = 266,921.37/x
  3. Step 3: Cross multiply
    393,978.20x = 590,118.48 × 266,921.37
  4. Step 4: Simplify right side
    393,978.20x = 157,515,233,143.92
  5. Step 5: Solve for x
    x = 157,515,233,143.92/393,978.20
  6. Step 6: Final answer
    x = 399,806.98

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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.