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Finding the Fourth Proportional to 715,581.86, 987,505.10 and 393,324.98

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Solution

The fourth proportional to 715,581.86, 987,505.10 and 393,324.98 is: 542,789.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,581.86 : 987,505.10 = 393,324.98 : x
  2. Step 2: Convert to fraction form
    715,581.86/987,505.10 = 393,324.98/x
  3. Step 3: Cross multiply
    715,581.86x = 987,505.10 × 393,324.98
  4. Step 4: Simplify right side
    715,581.86x = 388,410,416,803.25
  5. Step 5: Solve for x
    x = 388,410,416,803.25/715,581.86
  6. Step 6: Final answer
    x = 542,789.64

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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.