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Finding the Fourth Proportional to 13,687.79, 18,885.92 and 8,310.09

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Solution

The fourth proportional to 13,687.79, 18,885.92 and 8,310.09 is: 11,465.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,687.79 : 18,885.92 = 8,310.09 : x
  2. Step 2: Convert to fraction form
    13,687.79/18,885.92 = 8,310.09/x
  3. Step 3: Cross multiply
    13,687.79x = 18,885.92 × 8,310.09
  4. Step 4: Simplify right side
    13,687.79x = 156,943,653.38
  5. Step 5: Solve for x
    x = 156,943,653.38/13,687.79
  6. Step 6: Final answer
    x = 11,465.96

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1.5x scale

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.