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Finding the Fourth Proportional to 721,102.02, 995,044.68 and 398,760.90

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Solution

The fourth proportional to 721,102.02, 995,044.68 and 398,760.90 is: 550,247.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,102.02 : 995,044.68 = 398,760.90 : x
  2. Step 2: Convert to fraction form
    721,102.02/995,044.68 = 398,760.90/x
  3. Step 3: Cross multiply
    721,102.02x = 995,044.68 × 398,760.90
  4. Step 4: Simplify right side
    721,102.02x = 396,784,912,137.01
  5. Step 5: Solve for x
    x = 396,784,912,137.01/721,102.02
  6. Step 6: Final answer
    x = 550,247.96

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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.