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Finding the Fourth Proportional to 18,811.76, 28,236 and 8,957.84

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Solution

The fourth proportional to 18,811.76, 28,236 and 8,957.84 is: 13,445.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,811.76 : 28,236 = 8,957.84 : x
  2. Step 2: Convert to fraction form
    18,811.76/28,236 = 8,957.84/x
  3. Step 3: Cross multiply
    18,811.76x = 28,236 × 8,957.84
  4. Step 4: Simplify right side
    18,811.76x = 252,933,570.24
  5. Step 5: Solve for x
    x = 252,933,570.24/18,811.76
  6. Step 6: Final answer
    x = 13,445.50

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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.