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Finding the Fourth Proportional to 91,344.80, 136,786.80 and 72,912.80

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Solution

The fourth proportional to 91,344.80, 136,786.80 and 72,912.80 is: 109,185.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,344.80 : 136,786.80 = 72,912.80 : x
  2. Step 2: Convert to fraction form
    91,344.80/136,786.80 = 72,912.80/x
  3. Step 3: Cross multiply
    91,344.80x = 136,786.80 × 72,912.80
  4. Step 4: Simplify right side
    91,344.80x = 9,973,508,591.04
  5. Step 5: Solve for x
    x = 9,973,508,591.04/91,344.80
  6. Step 6: Final answer
    x = 109,185.29

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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.