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Finding the Fourth Proportional to 680,456.88, 938,969.46 and 393,996.30

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Solution

The fourth proportional to 680,456.88, 938,969.46 and 393,996.30 is: 543,679.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,456.88 : 938,969.46 = 393,996.30 : x
  2. Step 2: Convert to fraction form
    680,456.88/938,969.46 = 393,996.30/x
  3. Step 3: Cross multiply
    680,456.88x = 938,969.46 × 393,996.30
  4. Step 4: Simplify right side
    680,456.88x = 369,950,493,053.00
  5. Step 5: Solve for x
    x = 369,950,493,053.00/680,456.88
  6. Step 6: Final answer
    x = 543,679.55

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1.5x scale

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.