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Finding the Fourth Proportional to 43,991.20, 65,986.80 and 12,401.20

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Solution

The fourth proportional to 43,991.20, 65,986.80 and 12,401.20 is: 18,601.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,991.20 : 65,986.80 = 12,401.20 : x
  2. Step 2: Convert to fraction form
    43,991.20/65,986.80 = 12,401.20/x
  3. Step 3: Cross multiply
    43,991.20x = 65,986.80 × 12,401.20
  4. Step 4: Simplify right side
    43,991.20x = 818,315,504.16
  5. Step 5: Solve for x
    x = 818,315,504.16/43,991.20
  6. Step 6: Final answer
    x = 18,601.80

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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.