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Finding the Fourth Proportional to 666,428.40, 998,087.40 and 653,065.20

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Solution

The fourth proportional to 666,428.40, 998,087.40 and 653,065.20 is: 978,073.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,428.40 : 998,087.40 = 653,065.20 : x
  2. Step 2: Convert to fraction form
    666,428.40/998,087.40 = 653,065.20/x
  3. Step 3: Cross multiply
    666,428.40x = 998,087.40 × 653,065.20
  4. Step 4: Simplify right side
    666,428.40x = 651,816,147,498.48
  5. Step 5: Solve for x
    x = 651,816,147,498.48/666,428.40
  6. Step 6: Final answer
    x = 978,073.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.