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Finding the Fourth Proportional to 20,405.76, 30,605.04 and 5,611.11

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Solution

The fourth proportional to 20,405.76, 30,605.04 and 5,611.11 is: 8,415.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,405.76 : 30,605.04 = 5,611.11 : x
  2. Step 2: Convert to fraction form
    20,405.76/30,605.04 = 5,611.11/x
  3. Step 3: Cross multiply
    20,405.76x = 30,605.04 × 5,611.11
  4. Step 4: Simplify right side
    20,405.76x = 171,728,131.23
  5. Step 5: Solve for x
    x = 171,728,131.23/20,405.76
  6. Step 6: Final answer
    x = 8,415.67

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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.