Home / 686,431.44-947,236.68-399,998.16

Finding the Fourth Proportional to 686,431.44, 947,236.68 and 399,998.16

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Solution

The fourth proportional to 686,431.44, 947,236.68 and 399,998.16 is: 551,974.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,431.44 : 947,236.68 = 399,998.16 : x
  2. Step 2: Convert to fraction form
    686,431.44/947,236.68 = 399,998.16/x
  3. Step 3: Cross multiply
    686,431.44x = 947,236.68 × 399,998.16
  4. Step 4: Simplify right side
    686,431.44x = 378,892,929,084.51
  5. Step 5: Solve for x
    x = 378,892,929,084.51/686,431.44
  6. Step 6: Final answer
    x = 551,974.91

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Double scale
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Similar ratio
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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.