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Finding the Fourth Proportional to 99,803.20, 149,704.80 and 90,617.80

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Solution

The fourth proportional to 99,803.20, 149,704.80 and 90,617.80 is: 135,926.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,803.20 : 149,704.80 = 90,617.80 : x
  2. Step 2: Convert to fraction form
    99,803.20/149,704.80 = 90,617.80/x
  3. Step 3: Cross multiply
    99,803.20x = 149,704.80 × 90,617.80
  4. Step 4: Simplify right side
    99,803.20x = 13,565,919,625.44
  5. Step 5: Solve for x
    x = 13,565,919,625.44/99,803.20
  6. Step 6: Final answer
    x = 135,926.70

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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.