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Finding the Fourth Proportional to 99,856,408.60, 149,784,612.90 and 81,716,555.80

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Solution

The fourth proportional to 99,856,408.60, 149,784,612.90 and 81,716,555.80 is: 122,574,833.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,856,408.60 : 149,784,612.90 = 81,716,555.80 : x
  2. Step 2: Convert to fraction form
    99,856,408.60/149,784,612.90 = 81,716,555.80/x
  3. Step 3: Cross multiply
    99,856,408.60x = 149,784,612.90 × 81,716,555.80
  4. Step 4: Simplify right side
    99,856,408.60x = 12,239,882,678,024,250
  5. Step 5: Solve for x
    x = 12,239,882,678,024,250/99,856,408.60
  6. Step 6: Final answer
    x = 122,574,833.70

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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.