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Finding the Fourth Proportional to 86,019,687.20, 129,029,530.80 and 77,260,800.80

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Solution

The fourth proportional to 86,019,687.20, 129,029,530.80 and 77,260,800.80 is: 115,891,201.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,019,687.20 : 129,029,530.80 = 77,260,800.80 : x
  2. Step 2: Convert to fraction form
    86,019,687.20/129,029,530.80 = 77,260,800.80/x
  3. Step 3: Cross multiply
    86,019,687.20x = 129,029,530.80 × 77,260,800.80
  4. Step 4: Simplify right side
    86,019,687.20x = 9,968,924,876,456,264
  5. Step 5: Solve for x
    x = 9,968,924,876,456,264/86,019,687.20
  6. Step 6: Final answer
    x = 115,891,201.20

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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.