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Finding the Fourth Proportional to 699,340.56, 965,146.00 and 393,398.70

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Solution

The fourth proportional to 699,340.56, 965,146.00 and 393,398.70 is: 542,921.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    699,340.56 : 965,146.00 = 393,398.70 : x
  2. Step 2: Convert to fraction form
    699,340.56/965,146.00 = 393,398.70/x
  3. Step 3: Cross multiply
    699,340.56x = 965,146.00 × 393,398.70
  4. Step 4: Simplify right side
    699,340.56x = 379,687,178,899.85
  5. Step 5: Solve for x
    x = 379,687,178,899.85/699,340.56
  6. Step 6: Final answer
    x = 542,921.72

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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.