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Finding the Fourth Proportional to 694,978.89, 959,063.53 and 389,057.78

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Solution

The fourth proportional to 694,978.89, 959,063.53 and 389,057.78 is: 536,895.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    694,978.89 : 959,063.53 = 389,057.78 : x
  2. Step 2: Convert to fraction form
    694,978.89/959,063.53 = 389,057.78/x
  3. Step 3: Cross multiply
    694,978.89x = 959,063.53 × 389,057.78
  4. Step 4: Simplify right side
    694,978.89x = 373,131,127,860.76
  5. Step 5: Solve for x
    x = 373,131,127,860.76/694,978.89
  6. Step 6: Final answer
    x = 536,895.63

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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.