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Finding the Fourth Proportional to 20,611.55, 30,919.77 and 7,281.78

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Solution

The fourth proportional to 20,611.55, 30,919.77 and 7,281.78 is: 10,923.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,611.55 : 30,919.77 = 7,281.78 : x
  2. Step 2: Convert to fraction form
    20,611.55/30,919.77 = 7,281.78/x
  3. Step 3: Cross multiply
    20,611.55x = 30,919.77 × 7,281.78
  4. Step 4: Simplify right side
    20,611.55x = 225,150,962.79
  5. Step 5: Solve for x
    x = 225,150,962.79/20,611.55
  6. Step 6: Final answer
    x = 10,923.54

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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.