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Finding the Fourth Proportional to 686,428.44, 947,232.54 and 399,995.16

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Solution

The fourth proportional to 686,428.44, 947,232.54 and 399,995.16 is: 551,970.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,428.44 : 947,232.54 = 399,995.16 : x
  2. Step 2: Convert to fraction form
    686,428.44/947,232.54 = 399,995.16/x
  3. Step 3: Cross multiply
    686,428.44x = 947,232.54 × 399,995.16
  4. Step 4: Simplify right side
    686,428.44x = 378,888,431,394.51
  5. Step 5: Solve for x
    x = 378,888,431,394.51/686,428.44
  6. Step 6: Final answer
    x = 551,970.77

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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.