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Finding the Fourth Proportional to 721,595.43, 995,786.80 and 399,305.34

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Solution

The fourth proportional to 721,595.43, 995,786.80 and 399,305.34 is: 551,033.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,595.43 : 995,786.80 = 399,305.34 : x
  2. Step 2: Convert to fraction form
    721,595.43/995,786.80 = 399,305.34/x
  3. Step 3: Cross multiply
    721,595.43x = 995,786.80 × 399,305.34
  4. Step 4: Simplify right side
    721,595.43x = 397,622,985,743.25
  5. Step 5: Solve for x
    x = 397,622,985,743.25/721,595.43
  6. Step 6: Final answer
    x = 551,033.13

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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.