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Finding the Fourth Proportional to 18,811.30, 28,224.15 and 8,415.58

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Solution

The fourth proportional to 18,811.30, 28,224.15 and 8,415.58 is: 12,626.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,811.30 : 28,224.15 = 8,415.58 : x
  2. Step 2: Convert to fraction form
    18,811.30/28,224.15 = 8,415.58/x
  3. Step 3: Cross multiply
    18,811.30x = 28,224.15 × 8,415.58
  4. Step 4: Simplify right side
    18,811.30x = 237,522,592.26
  5. Step 5: Solve for x
    x = 237,522,592.26/18,811.30
  6. Step 6: Final answer
    x = 12,626.59

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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.