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Finding the Fourth Proportional to 18,905.18, 28,372.89 and 8,517.74

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Solution

The fourth proportional to 18,905.18, 28,372.89 and 8,517.74 is: 12,783.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,905.18 : 28,372.89 = 8,517.74 : x
  2. Step 2: Convert to fraction form
    18,905.18/28,372.89 = 8,517.74/x
  3. Step 3: Cross multiply
    18,905.18x = 28,372.89 × 8,517.74
  4. Step 4: Simplify right side
    18,905.18x = 241,672,900.07
  5. Step 5: Solve for x
    x = 241,672,900.07/18,905.18
  6. Step 6: Final answer
    x = 12,783.42

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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.