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Finding the Fourth Proportional to 100,372.42, 150,586.17 and 81,605.80

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Solution

The fourth proportional to 100,372.42, 150,586.17 and 81,605.80 is: 122,431.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,372.42 : 150,586.17 = 81,605.80 : x
  2. Step 2: Convert to fraction form
    100,372.42/150,586.17 = 81,605.80/x
  3. Step 3: Cross multiply
    100,372.42x = 150,586.17 × 81,605.80
  4. Step 4: Simplify right side
    100,372.42x = 12,288,704,871.79
  5. Step 5: Solve for x
    x = 12,288,704,871.79/100,372.42
  6. Step 6: Final answer
    x = 122,431.09

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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.