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Finding the Fourth Proportional to 85,784,078.60, 128,694,780.30 and 28,266,561.80

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Solution

The fourth proportional to 85,784,078.60, 128,694,780.30 and 28,266,561.80 is: 42,405,992.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,784,078.60 : 128,694,780.30 = 28,266,561.80 : x
  2. Step 2: Convert to fraction form
    85,784,078.60/128,694,780.30 = 28,266,561.80/x
  3. Step 3: Cross multiply
    85,784,078.60x = 128,694,780.30 × 28,266,561.80
  4. Step 4: Simplify right side
    85,784,078.60x = 3,637,758,960,687,372.50
  5. Step 5: Solve for x
    x = 3,637,758,960,687,372.50/85,784,078.60
  6. Step 6: Final answer
    x = 42,405,992.11

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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.