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Finding the Fourth Proportional to 81,491.70, 122,237.55 and 70,556.70

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Solution

The fourth proportional to 81,491.70, 122,237.55 and 70,556.70 is: 105,835.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,491.70 : 122,237.55 = 70,556.70 : x
  2. Step 2: Convert to fraction form
    81,491.70/122,237.55 = 70,556.70/x
  3. Step 3: Cross multiply
    81,491.70x = 122,237.55 × 70,556.70
  4. Step 4: Simplify right side
    81,491.70x = 8,624,678,144.09
  5. Step 5: Solve for x
    x = 8,624,678,144.09/81,491.70
  6. Step 6: Final answer
    x = 105,835.05

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1.5x scale

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.