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Finding the Fourth Proportional to 721,640.89, 995,866.37 and 399,373.21

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Solution

The fourth proportional to 721,640.89, 995,866.37 and 399,373.21 is: 551,136.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,640.89 : 995,866.37 = 399,373.21 : x
  2. Step 2: Convert to fraction form
    721,640.89/995,866.37 = 399,373.21/x
  3. Step 3: Cross multiply
    721,640.89x = 995,866.37 × 399,373.21
  4. Step 4: Simplify right side
    721,640.89x = 397,722,348,917.95
  5. Step 5: Solve for x
    x = 397,722,348,917.95/721,640.89
  6. Step 6: Final answer
    x = 551,136.10

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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.