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Finding the Fourth Proportional to 721,561.38, 995,859.80 and 415,578.21

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Solution

The fourth proportional to 721,561.38, 995,859.80 and 415,578.21 is: 573,558.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,561.38 : 995,859.80 = 415,578.21 : x
  2. Step 2: Convert to fraction form
    721,561.38/995,859.80 = 415,578.21/x
  3. Step 3: Cross multiply
    721,561.38x = 995,859.80 × 415,578.21
  4. Step 4: Simplify right side
    721,561.38x = 413,857,633,094.96
  5. Step 5: Solve for x
    x = 413,857,633,094.96/721,561.38
  6. Step 6: Final answer
    x = 573,558.46

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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.