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Finding the Fourth Proportional to 87,989.80, 131,984.70 and 79,954.60

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Solution

The fourth proportional to 87,989.80, 131,984.70 and 79,954.60 is: 119,931.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,989.80 : 131,984.70 = 79,954.60 : x
  2. Step 2: Convert to fraction form
    87,989.80/131,984.70 = 79,954.60/x
  3. Step 3: Cross multiply
    87,989.80x = 131,984.70 × 79,954.60
  4. Step 4: Simplify right side
    87,989.80x = 10,552,783,894.62
  5. Step 5: Solve for x
    x = 10,552,783,894.62/87,989.80
  6. Step 6: Final answer
    x = 119,931.90

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Similar ratio
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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.