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Finding the Fourth Proportional to 721,714.38, 995,958.51 and 399,425.10

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Solution

The fourth proportional to 721,714.38, 995,958.51 and 399,425.10 is: 551,202.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,714.38 : 995,958.51 = 399,425.10 : x
  2. Step 2: Convert to fraction form
    721,714.38/995,958.51 = 399,425.10/x
  3. Step 3: Cross multiply
    721,714.38x = 995,958.51 × 399,425.10
  4. Step 4: Simplify right side
    721,714.38x = 397,810,827,452.60
  5. Step 5: Solve for x
    x = 397,810,827,452.60/721,714.38
  6. Step 6: Final answer
    x = 551,202.58

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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.