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Finding the Fourth Proportional to 103,996.80, 155,764.80 and 90,172.80

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Solution

The fourth proportional to 103,996.80, 155,764.80 and 90,172.80 is: 135,059.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,996.80 : 155,764.80 = 90,172.80 : x
  2. Step 2: Convert to fraction form
    103,996.80/155,764.80 = 90,172.80/x
  3. Step 3: Cross multiply
    103,996.80x = 155,764.80 × 90,172.80
  4. Step 4: Simplify right side
    103,996.80x = 14,045,748,157.44
  5. Step 5: Solve for x
    x = 14,045,748,157.44/103,996.80
  6. Step 6: Final answer
    x = 135,059.43

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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.