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Finding the Fourth Proportional to 91,172.80, 136,564.80 and 75,620.80

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Solution

The fourth proportional to 91,172.80, 136,564.80 and 75,620.80 is: 113,269.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,172.80 : 136,564.80 = 75,620.80 : x
  2. Step 2: Convert to fraction form
    91,172.80/136,564.80 = 75,620.80/x
  3. Step 3: Cross multiply
    91,172.80x = 136,564.80 × 75,620.80
  4. Step 4: Simplify right side
    91,172.80x = 10,327,139,427.84
  5. Step 5: Solve for x
    x = 10,327,139,427.84/91,172.80
  6. Step 6: Final answer
    x = 113,269.96

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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.