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Finding the Fourth Proportional to 13,679.15, 18,864.63 and 8,634.65

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Solution

The fourth proportional to 13,679.15, 18,864.63 and 8,634.65 is: 11,907.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,679.15 : 18,864.63 = 8,634.65 : x
  2. Step 2: Convert to fraction form
    13,679.15/18,864.63 = 8,634.65/x
  3. Step 3: Cross multiply
    13,679.15x = 18,864.63 × 8,634.65
  4. Step 4: Simplify right side
    13,679.15x = 162,889,383.11
  5. Step 5: Solve for x
    x = 162,889,383.11/13,679.15
  6. Step 6: Final answer
    x = 11,907.86

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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.