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Finding the Fourth Proportional to 666,825.21, 920,160.54 and 394,844.49

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Solution

The fourth proportional to 666,825.21, 920,160.54 and 394,844.49 is: 544,850.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,825.21 : 920,160.54 = 394,844.49 : x
  2. Step 2: Convert to fraction form
    666,825.21/920,160.54 = 394,844.49/x
  3. Step 3: Cross multiply
    666,825.21x = 920,160.54 × 394,844.49
  4. Step 4: Simplify right side
    666,825.21x = 363,320,319,134.43
  5. Step 5: Solve for x
    x = 363,320,319,134.43/666,825.21
  6. Step 6: Final answer
    x = 544,850.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.