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Finding the Fourth Proportional to 85,784,077.60, 128,694,778.80 and 28,266,560.80

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Solution

The fourth proportional to 85,784,077.60, 128,694,778.80 and 28,266,560.80 is: 42,405,990.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,784,077.60 : 128,694,778.80 = 28,266,560.80 : x
  2. Step 2: Convert to fraction form
    85,784,077.60/128,694,778.80 = 28,266,560.80/x
  3. Step 3: Cross multiply
    85,784,077.60x = 128,694,778.80 × 28,266,560.80
  4. Step 4: Simplify right side
    85,784,077.60x = 3,637,758,789,592,751
  5. Step 5: Solve for x
    x = 3,637,758,789,592,751/85,784,077.60
  6. Step 6: Final answer
    x = 42,405,990.61

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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.