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Finding the Fourth Proportional to 13,605.91, 18,776.17 and 7,639.52

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Solution

The fourth proportional to 13,605.91, 18,776.17 and 7,639.52 is: 10,542.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,605.91 : 18,776.17 = 7,639.52 : x
  2. Step 2: Convert to fraction form
    13,605.91/18,776.17 = 7,639.52/x
  3. Step 3: Cross multiply
    13,605.91x = 18,776.17 × 7,639.52
  4. Step 4: Simplify right side
    13,605.91x = 143,440,841.91
  5. Step 5: Solve for x
    x = 143,440,841.91/13,605.91
  6. Step 6: Final answer
    x = 10,542.54

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