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Finding the Fourth Proportional to 80,438.40, 120,715.20 and 33,724.80

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Solution

The fourth proportional to 80,438.40, 120,715.20 and 33,724.80 is: 50,611.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,438.40 : 120,715.20 = 33,724.80 : x
  2. Step 2: Convert to fraction form
    80,438.40/120,715.20 = 33,724.80/x
  3. Step 3: Cross multiply
    80,438.40x = 120,715.20 × 33,724.80
  4. Step 4: Simplify right side
    80,438.40x = 4,071,095,976.96
  5. Step 5: Solve for x
    x = 4,071,095,976.96/80,438.40
  6. Step 6: Final answer
    x = 50,611.35

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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.