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Finding the Fourth Proportional to 721,627.66, 995,821.67 and 399,351.34

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Solution

The fourth proportional to 721,627.66, 995,821.67 and 399,351.34 is: 551,091.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,627.66 : 995,821.67 = 399,351.34 : x
  2. Step 2: Convert to fraction form
    721,627.66/995,821.67 = 399,351.34/x
  3. Step 3: Cross multiply
    721,627.66x = 995,821.67 × 399,351.34
  4. Step 4: Simplify right side
    721,627.66x = 397,682,718,315.54
  5. Step 5: Solve for x
    x = 397,682,718,315.54/721,627.66
  6. Step 6: Final answer
    x = 551,091.29

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Double scale
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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.