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Finding the Fourth Proportional to 721,164.58, 995,119.74 and 398,830.78

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Solution

The fourth proportional to 721,164.58, 995,119.74 and 398,830.78 is: 550,338.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,164.58 : 995,119.74 = 398,830.78 : x
  2. Step 2: Convert to fraction form
    721,164.58/995,119.74 = 398,830.78/x
  3. Step 3: Cross multiply
    721,164.58x = 995,119.74 × 398,830.78
  4. Step 4: Simplify right side
    721,164.58x = 396,884,382,097.60
  5. Step 5: Solve for x
    x = 396,884,382,097.60/721,164.58
  6. Step 6: Final answer
    x = 550,338.15

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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.