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Finding the Fourth Proportional to 716,099.69, 988,197.86 and 393,809.78

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Solution

The fourth proportional to 716,099.69, 988,197.86 and 393,809.78 is: 543,446.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,099.69 : 988,197.86 = 393,809.78 : x
  2. Step 2: Convert to fraction form
    716,099.69/988,197.86 = 393,809.78/x
  3. Step 3: Cross multiply
    716,099.69x = 988,197.86 × 393,809.78
  4. Step 4: Simplify right side
    716,099.69x = 389,161,981,843.07
  5. Step 5: Solve for x
    x = 389,161,981,843.07/716,099.69
  6. Step 6: Final answer
    x = 543,446.66

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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.