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Finding the Fourth Proportional to 711,170.76, 981,476.10 and 405,340.68

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Solution

The fourth proportional to 711,170.76, 981,476.10 and 405,340.68 is: 559,404.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,170.76 : 981,476.10 = 405,340.68 : x
  2. Step 2: Convert to fraction form
    711,170.76/981,476.10 = 405,340.68/x
  3. Step 3: Cross multiply
    711,170.76x = 981,476.10 × 405,340.68
  4. Step 4: Simplify right side
    711,170.76x = 397,832,189,777.75
  5. Step 5: Solve for x
    x = 397,832,189,777.75/711,170.76
  6. Step 6: Final answer
    x = 559,404.59

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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.