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Finding the Fourth Proportional to 20,611.83, 30,931.38 and 8,130.27

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Solution

The fourth proportional to 20,611.83, 30,931.38 and 8,130.27 is: 12,200.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,611.83 : 30,931.38 = 8,130.27 : x
  2. Step 2: Convert to fraction form
    20,611.83/30,931.38 = 8,130.27/x
  3. Step 3: Cross multiply
    20,611.83x = 30,931.38 × 8,130.27
  4. Step 4: Simplify right side
    20,611.83x = 251,480,470.87
  5. Step 5: Solve for x
    x = 251,480,470.87/20,611.83
  6. Step 6: Final answer
    x = 12,200.78

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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.