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Finding the Fourth Proportional to 721,808.28, 995,957.10 and 399,503.16

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Solution

The fourth proportional to 721,808.28, 995,957.10 and 399,503.16 is: 551,237.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,808.28 : 995,957.10 = 399,503.16 : x
  2. Step 2: Convert to fraction form
    721,808.28/995,957.10 = 399,503.16/x
  3. Step 3: Cross multiply
    721,808.28x = 995,957.10 × 399,503.16
  4. Step 4: Simplify right side
    721,808.28x = 397,888,008,674.44
  5. Step 5: Solve for x
    x = 397,888,008,674.44/721,808.28
  6. Step 6: Final answer
    x = 551,237.80

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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.