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Finding the Fourth Proportional to 13,605.46, 20,391.18 and 5,805.16

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Solution

The fourth proportional to 13,605.46, 20,391.18 and 5,805.16 is: 8,700.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,605.46 : 20,391.18 = 5,805.16 : x
  2. Step 2: Convert to fraction form
    13,605.46/20,391.18 = 5,805.16/x
  3. Step 3: Cross multiply
    13,605.46x = 20,391.18 × 5,805.16
  4. Step 4: Simplify right side
    13,605.46x = 118,374,062.49
  5. Step 5: Solve for x
    x = 118,374,062.49/13,605.46
  6. Step 6: Final answer
    x = 8,700.48

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.