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Finding the Fourth Proportional to 103,942.80, 155,683.80 and 80,493.20

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Solution

The fourth proportional to 103,942.80, 155,683.80 and 80,493.20 is: 120,561.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,942.80 : 155,683.80 = 80,493.20 : x
  2. Step 2: Convert to fraction form
    103,942.80/155,683.80 = 80,493.20/x
  3. Step 3: Cross multiply
    103,942.80x = 155,683.80 × 80,493.20
  4. Step 4: Simplify right side
    103,942.80x = 12,531,487,250.16
  5. Step 5: Solve for x
    x = 12,531,487,250.16/103,942.80
  6. Step 6: Final answer
    x = 120,561.38

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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.