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Finding the Fourth Proportional to 13,679.21, 18,867.96 and 8,376.65

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Solution

The fourth proportional to 13,679.21, 18,867.96 and 8,376.65 is: 11,554.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,679.21 : 18,867.96 = 8,376.65 : x
  2. Step 2: Convert to fraction form
    13,679.21/18,867.96 = 8,376.65/x
  3. Step 3: Cross multiply
    13,679.21x = 18,867.96 × 8,376.65
  4. Step 4: Simplify right side
    13,679.21x = 158,050,297.13
  5. Step 5: Solve for x
    x = 158,050,297.13/13,679.21
  6. Step 6: Final answer
    x = 11,554.05

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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.