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Finding the Fourth Proportional to 91,043.20, 136,564.80 and 75,491.20

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Solution

The fourth proportional to 91,043.20, 136,564.80 and 75,491.20 is: 113,236.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,043.20 : 136,564.80 = 75,491.20 : x
  2. Step 2: Convert to fraction form
    91,043.20/136,564.80 = 75,491.20/x
  3. Step 3: Cross multiply
    91,043.20x = 136,564.80 × 75,491.20
  4. Step 4: Simplify right side
    91,043.20x = 10,309,440,629.76
  5. Step 5: Solve for x
    x = 10,309,440,629.76/91,043.20
  6. Step 6: Final answer
    x = 113,236.80

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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.