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Finding the Fourth Proportional to 721,807.82, 996,069.39 and 399,518.54

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Solution

The fourth proportional to 721,807.82, 996,069.39 and 399,518.54 is: 551,321.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,807.82 : 996,069.39 = 399,518.54 : x
  2. Step 2: Convert to fraction form
    721,807.82/996,069.39 = 399,518.54/x
  3. Step 3: Cross multiply
    721,807.82x = 996,069.39 × 399,518.54
  4. Step 4: Simplify right side
    721,807.82x = 397,948,188,431.49
  5. Step 5: Solve for x
    x = 397,948,188,431.49/721,807.82
  6. Step 6: Final answer
    x = 551,321.53

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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.