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Finding the Fourth Proportional to 103,621.60, 155,662.80 and 99,704.80

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Solution

The fourth proportional to 103,621.60, 155,662.80 and 99,704.80 is: 149,778.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,621.60 : 155,662.80 = 99,704.80 : x
  2. Step 2: Convert to fraction form
    103,621.60/155,662.80 = 99,704.80/x
  3. Step 3: Cross multiply
    103,621.60x = 155,662.80 × 99,704.80
  4. Step 4: Simplify right side
    103,621.60x = 15,520,328,341.44
  5. Step 5: Solve for x
    x = 15,520,328,341.44/103,621.60
  6. Step 6: Final answer
    x = 149,778.89

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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.