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Finding the Fourth Proportional to 15,161.50, 20,922.06 and 8,355.30

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Solution

The fourth proportional to 15,161.50, 20,922.06 and 8,355.30 is: 11,529.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,161.50 : 20,922.06 = 8,355.30 : x
  2. Step 2: Convert to fraction form
    15,161.50/20,922.06 = 8,355.30/x
  3. Step 3: Cross multiply
    15,161.50x = 20,922.06 × 8,355.30
  4. Step 4: Simplify right side
    15,161.50x = 174,810,087.92
  5. Step 5: Solve for x
    x = 174,810,087.92/15,161.50
  6. Step 6: Final answer
    x = 11,529.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.