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Finding the Fourth Proportional to 721,208.32, 995,200.69 and 398,911.48

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Solution

The fourth proportional to 721,208.32, 995,200.69 and 398,911.48 is: 550,460.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,208.32 : 995,200.69 = 398,911.48 : x
  2. Step 2: Convert to fraction form
    721,208.32/995,200.69 = 398,911.48/x
  3. Step 3: Cross multiply
    721,208.32x = 995,200.69 × 398,911.48
  4. Step 4: Simplify right side
    721,208.32x = 396,996,973,174.36
  5. Step 5: Solve for x
    x = 396,996,973,174.36/721,208.32
  6. Step 6: Final answer
    x = 550,460.89

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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.