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Finding the Fourth Proportional to 70,938.99, 106,408.49 and 21,019.80

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Solution

The fourth proportional to 70,938.99, 106,408.49 and 21,019.80 is: 31,529.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,938.99 : 106,408.49 = 21,019.80 : x
  2. Step 2: Convert to fraction form
    70,938.99/106,408.49 = 21,019.80/x
  3. Step 3: Cross multiply
    70,938.99x = 106,408.49 × 21,019.80
  4. Step 4: Simplify right side
    70,938.99x = 2,236,685,472.03
  5. Step 5: Solve for x
    x = 2,236,685,472.03/70,938.99
  6. Step 6: Final answer
    x = 31,529.71

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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.