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Finding the Fourth Proportional to 721,635.68, 995,842.20 and 399,326.60

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Solution

The fourth proportional to 721,635.68, 995,842.20 and 399,326.60 is: 551,062.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,635.68 : 995,842.20 = 399,326.60 : x
  2. Step 2: Convert to fraction form
    721,635.68/995,842.20 = 399,326.60/x
  3. Step 3: Cross multiply
    721,635.68x = 995,842.20 × 399,326.60
  4. Step 4: Simplify right side
    721,635.68x = 397,666,279,862.52
  5. Step 5: Solve for x
    x = 397,666,279,862.52/721,635.68
  6. Step 6: Final answer
    x = 551,062.39

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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.