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Finding the Fourth Proportional to 20,411.55, 30,611.54 and 7,928.91

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Solution

The fourth proportional to 20,411.55, 30,611.54 and 7,928.91 is: 11,891.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,411.55 : 30,611.54 = 7,928.91 : x
  2. Step 2: Convert to fraction form
    20,411.55/30,611.54 = 7,928.91/x
  3. Step 3: Cross multiply
    20,411.55x = 30,611.54 × 7,928.91
  4. Step 4: Simplify right side
    20,411.55x = 242,716,165.44
  5. Step 5: Solve for x
    x = 242,716,165.44/20,411.55
  6. Step 6: Final answer
    x = 11,891.12

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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.