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Finding the Fourth Proportional to 91,128.80, 125,571.12 and 67,217.60

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Solution

The fourth proportional to 91,128.80, 125,571.12 and 67,217.60 is: 92,622.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,128.80 : 125,571.12 = 67,217.60 : x
  2. Step 2: Convert to fraction form
    91,128.80/125,571.12 = 67,217.60/x
  3. Step 3: Cross multiply
    91,128.80x = 125,571.12 × 67,217.60
  4. Step 4: Simplify right side
    91,128.80x = 8,440,589,315.71
  5. Step 5: Solve for x
    x = 8,440,589,315.71/91,128.80
  6. Step 6: Final answer
    x = 92,622.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.