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Finding the Fourth Proportional to 721,819, 996,005.97 and 399,528.33

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Solution

The fourth proportional to 721,819, 996,005.97 and 399,528.33 is: 551,291.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,819 : 996,005.97 = 399,528.33 : x
  2. Step 2: Convert to fraction form
    721,819/996,005.97 = 399,528.33/x
  3. Step 3: Cross multiply
    721,819x = 996,005.97 × 399,528.33
  4. Step 4: Simplify right side
    721,819x = 397,932,601,864.13
  5. Step 5: Solve for x
    x = 397,932,601,864.13/721,819
  6. Step 6: Final answer
    x = 551,291.39

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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.