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Finding the Fourth Proportional to 721,099, 995,077.47 and 398,790.28

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Solution

The fourth proportional to 721,099, 995,077.47 and 398,790.28 is: 550,308.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,099 : 995,077.47 = 398,790.28 : x
  2. Step 2: Convert to fraction form
    721,099/995,077.47 = 398,790.28/x
  3. Step 3: Cross multiply
    721,099x = 995,077.47 × 398,790.28
  4. Step 4: Simplify right side
    721,099x = 396,827,222,882.99
  5. Step 5: Solve for x
    x = 396,827,222,882.99/721,099
  6. Step 6: Final answer
    x = 550,308.94

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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.