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Finding the Fourth Proportional to 686,243.60, 947,004.72 and 376,143.20

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Solution

The fourth proportional to 686,243.60, 947,004.72 and 376,143.20 is: 519,071.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,243.60 : 947,004.72 = 376,143.20 : x
  2. Step 2: Convert to fraction form
    686,243.60/947,004.72 = 376,143.20/x
  3. Step 3: Cross multiply
    686,243.60x = 947,004.72 × 376,143.20
  4. Step 4: Simplify right side
    686,243.60x = 356,209,385,795.90
  5. Step 5: Solve for x
    x = 356,209,385,795.90/686,243.60
  6. Step 6: Final answer
    x = 519,071.34

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Half scale
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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.