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Finding the Fourth Proportional to 721,313.96, 995,404.74 and 398,998.76

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Solution

The fourth proportional to 721,313.96, 995,404.74 and 398,998.76 is: 550,613.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,313.96 : 995,404.74 = 398,998.76 : x
  2. Step 2: Convert to fraction form
    721,313.96/995,404.74 = 398,998.76/x
  3. Step 3: Cross multiply
    721,313.96x = 995,404.74 × 398,998.76
  4. Step 4: Simplify right side
    721,313.96x = 397,165,256,958.12
  5. Step 5: Solve for x
    x = 397,165,256,958.12/721,313.96
  6. Step 6: Final answer
    x = 550,613.57

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Double scale
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Similar ratio
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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.