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Finding the Fourth Proportional to 45,611.85, 68,416.27 and 20,651.90

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Solution

The fourth proportional to 45,611.85, 68,416.27 and 20,651.90 is: 30,977.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,611.85 : 68,416.27 = 20,651.90 : x
  2. Step 2: Convert to fraction form
    45,611.85/68,416.27 = 20,651.90/x
  3. Step 3: Cross multiply
    45,611.85x = 68,416.27 × 20,651.90
  4. Step 4: Simplify right side
    45,611.85x = 1,412,925,966.41
  5. Step 5: Solve for x
    x = 1,412,925,966.41/45,611.85
  6. Step 6: Final answer
    x = 30,977.17

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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.