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Finding the Fourth Proportional to 81,491.20, 122,236.80 and 70,556.20

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Solution

The fourth proportional to 81,491.20, 122,236.80 and 70,556.20 is: 105,834.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,491.20 : 122,236.80 = 70,556.20 : x
  2. Step 2: Convert to fraction form
    81,491.20/122,236.80 = 70,556.20/x
  3. Step 3: Cross multiply
    81,491.20x = 122,236.80 × 70,556.20
  4. Step 4: Simplify right side
    81,491.20x = 8,624,564,108.16
  5. Step 5: Solve for x
    x = 8,624,564,108.16/81,491.20
  6. Step 6: Final answer
    x = 105,834.30

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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.