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Finding the Fourth Proportional to 20,378.55, 30,499.79 and 11,611.11

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Solution

The fourth proportional to 20,378.55, 30,499.79 and 11,611.11 is: 17,377.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,378.55 : 30,499.79 = 11,611.11 : x
  2. Step 2: Convert to fraction form
    20,378.55/30,499.79 = 11,611.11/x
  3. Step 3: Cross multiply
    20,378.55x = 30,499.79 × 11,611.11
  4. Step 4: Simplify right side
    20,378.55x = 354,136,358.61
  5. Step 5: Solve for x
    x = 354,136,358.61/20,378.55
  6. Step 6: Final answer
    x = 17,377.90

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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.