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Finding the Fourth Proportional to 721,786.64, 996,053.48 and 399,489.88

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Solution

The fourth proportional to 721,786.64, 996,053.48 and 399,489.88 is: 551,289.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,786.64 : 996,053.48 = 399,489.88 : x
  2. Step 2: Convert to fraction form
    721,786.64/996,053.48 = 399,489.88/x
  3. Step 3: Cross multiply
    721,786.64x = 996,053.48 × 399,489.88
  4. Step 4: Simplify right side
    721,786.64x = 397,913,285,198.78
  5. Step 5: Solve for x
    x = 397,913,285,198.78/721,786.64
  6. Step 6: Final answer
    x = 551,289.35

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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.