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Finding the Fourth Proportional to 666,380.88, 919,724 and 394,599.64

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Solution

The fourth proportional to 666,380.88, 919,724 and 394,599.64 is: 544,617.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,380.88 : 919,724 = 394,599.64 : x
  2. Step 2: Convert to fraction form
    666,380.88/919,724 = 394,599.64/x
  3. Step 3: Cross multiply
    666,380.88x = 919,724 × 394,599.64
  4. Step 4: Simplify right side
    666,380.88x = 362,922,759,299.36
  5. Step 5: Solve for x
    x = 362,922,759,299.36/666,380.88
  6. Step 6: Final answer
    x = 544,617.61

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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.