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Finding the Fourth Proportional to 20,611.35, 30,919.49 and 7,281.59

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Solution

The fourth proportional to 20,611.35, 30,919.49 and 7,281.59 is: 10,923.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,611.35 : 30,919.49 = 7,281.59 : x
  2. Step 2: Convert to fraction form
    20,611.35/30,919.49 = 7,281.59/x
  3. Step 3: Cross multiply
    20,611.35x = 30,919.49 × 7,281.59
  4. Step 4: Simplify right side
    20,611.35x = 225,142,885.49
  5. Step 5: Solve for x
    x = 225,142,885.49/20,611.35
  6. Step 6: Final answer
    x = 10,923.25

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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.