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Finding the Fourth Proportional to 721,505.17, 995,635.54 and 399,196.04

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Solution

The fourth proportional to 721,505.17, 995,635.54 and 399,196.04 is: 550,867.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,505.17 : 995,635.54 = 399,196.04 : x
  2. Step 2: Convert to fraction form
    721,505.17/995,635.54 = 399,196.04/x
  3. Step 3: Cross multiply
    721,505.17x = 995,635.54 × 399,196.04
  4. Step 4: Simplify right side
    721,505.17x = 397,453,766,342.36
  5. Step 5: Solve for x
    x = 397,453,766,342.36/721,505.17
  6. Step 6: Final answer
    x = 550,867.53

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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.