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Finding the Fourth Proportional to 86,019,687.70, 129,029,531.55 and 77,260,801.30

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Solution

The fourth proportional to 86,019,687.70, 129,029,531.55 and 77,260,801.30 is: 115,891,201.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,019,687.70 : 129,029,531.55 = 77,260,801.30 : x
  2. Step 2: Convert to fraction form
    86,019,687.70/129,029,531.55 = 77,260,801.30/x
  3. Step 3: Cross multiply
    86,019,687.70x = 129,029,531.55 × 77,260,801.30
  4. Step 4: Simplify right side
    86,019,687.70x = 9,968,924,998,916,630
  5. Step 5: Solve for x
    x = 9,968,924,998,916,630/86,019,687.70
  6. Step 6: Final answer
    x = 115,891,201.95

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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.