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Finding the Fourth Proportional to 18,692.96, 25,781.64 and 11,979.21

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Solution

The fourth proportional to 18,692.96, 25,781.64 and 11,979.21 is: 16,521.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,692.96 : 25,781.64 = 11,979.21 : x
  2. Step 2: Convert to fraction form
    18,692.96/25,781.64 = 11,979.21/x
  3. Step 3: Cross multiply
    18,692.96x = 25,781.64 × 11,979.21
  4. Step 4: Simplify right side
    18,692.96x = 308,843,679.70
  5. Step 5: Solve for x
    x = 308,843,679.70/18,692.96
  6. Step 6: Final answer
    x = 16,521.93

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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.