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Finding the Fourth Proportional to 660,861, 912,065.94 and 392,589

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Solution

The fourth proportional to 660,861, 912,065.94 and 392,589 is: 541,819.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,861 : 912,065.94 = 392,589 : x
  2. Step 2: Convert to fraction form
    660,861/912,065.94 = 392,589/x
  3. Step 3: Cross multiply
    660,861x = 912,065.94 × 392,589
  4. Step 4: Simplify right side
    660,861x = 358,067,055,318.66
  5. Step 5: Solve for x
    x = 358,067,055,318.66/660,861
  6. Step 6: Final answer
    x = 541,819.01

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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.