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Finding the Fourth Proportional to 91,410.80, 136,921.80 and 75,858.80

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Solution

The fourth proportional to 91,410.80, 136,921.80 and 75,858.80 is: 113,626.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,410.80 : 136,921.80 = 75,858.80 : x
  2. Step 2: Convert to fraction form
    91,410.80/136,921.80 = 75,858.80/x
  3. Step 3: Cross multiply
    91,410.80x = 136,921.80 × 75,858.80
  4. Step 4: Simplify right side
    91,410.80x = 10,386,723,441.84
  5. Step 5: Solve for x
    x = 10,386,723,441.84/91,410.80
  6. Step 6: Final answer
    x = 113,626.87

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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.