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Finding the Fourth Proportional to 13,682.84, 18,885.87 and 8,915.85

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Solution

The fourth proportional to 13,682.84, 18,885.87 and 8,915.85 is: 12,306.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,682.84 : 18,885.87 = 8,915.85 : x
  2. Step 2: Convert to fraction form
    13,682.84/18,885.87 = 8,915.85/x
  3. Step 3: Cross multiply
    13,682.84x = 18,885.87 × 8,915.85
  4. Step 4: Simplify right side
    13,682.84x = 168,383,584.04
  5. Step 5: Solve for x
    x = 168,383,584.04/13,682.84
  6. Step 6: Final answer
    x = 12,306.19

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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.