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Finding the Fourth Proportional to 13,540.45, 18,687.56 and 7,572.45

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Solution

The fourth proportional to 13,540.45, 18,687.56 and 7,572.45 is: 10,450.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,540.45 : 18,687.56 = 7,572.45 : x
  2. Step 2: Convert to fraction form
    13,540.45/18,687.56 = 7,572.45/x
  3. Step 3: Cross multiply
    13,540.45x = 18,687.56 × 7,572.45
  4. Step 4: Simplify right side
    13,540.45x = 141,510,688.53
  5. Step 5: Solve for x
    x = 141,510,688.53/13,540.45
  6. Step 6: Final answer
    x = 10,450.96

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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.