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Finding the Fourth Proportional to 721,210.32, 995,203.44 and 398,913.48

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Solution

The fourth proportional to 721,210.32, 995,203.44 and 398,913.48 is: 550,463.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,210.32 : 995,203.44 = 398,913.48 : x
  2. Step 2: Convert to fraction form
    721,210.32/995,203.44 = 398,913.48/x
  3. Step 3: Cross multiply
    721,210.32x = 995,203.44 × 398,913.48
  4. Step 4: Simplify right side
    721,210.32x = 397,000,067,558.37
  5. Step 5: Solve for x
    x = 397,000,067,558.37/721,210.32
  6. Step 6: Final answer
    x = 550,463.65

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Double scale
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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.