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Finding the Fourth Proportional to 45,611.60, 68,415.90 and 20,651.65

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Solution

The fourth proportional to 45,611.60, 68,415.90 and 20,651.65 is: 30,976.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,611.60 : 68,415.90 = 20,651.65 : x
  2. Step 2: Convert to fraction form
    45,611.60/68,415.90 = 20,651.65/x
  3. Step 3: Cross multiply
    45,611.60x = 68,415.90 × 20,651.65
  4. Step 4: Simplify right side
    45,611.60x = 1,412,901,221.24
  5. Step 5: Solve for x
    x = 1,412,901,221.24/45,611.60
  6. Step 6: Final answer
    x = 30,976.80

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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.