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Finding the Fourth Proportional to 85,884,696.80, 128,743,064.40 and 76,814,770.40

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Solution

The fourth proportional to 85,884,696.80, 128,743,064.40 and 76,814,770.40 is: 115,147,043.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,884,696.80 : 128,743,064.40 = 76,814,770.40 : x
  2. Step 2: Convert to fraction form
    85,884,696.80/128,743,064.40 = 76,814,770.40/x
  3. Step 3: Cross multiply
    85,884,696.80x = 128,743,064.40 × 76,814,770.40
  4. Step 4: Simplify right side
    85,884,696.80x = 9,889,368,932,478,414
  5. Step 5: Solve for x
    x = 9,889,368,932,478,414/85,884,696.80
  6. Step 6: Final answer
    x = 115,147,043.66

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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.