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Finding the Fourth Proportional to 12,692.13, 18,998.31 and 8,720.16

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Solution

The fourth proportional to 12,692.13, 18,998.31 and 8,720.16 is: 13,052.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,692.13 : 18,998.31 = 8,720.16 : x
  2. Step 2: Convert to fraction form
    12,692.13/18,998.31 = 8,720.16/x
  3. Step 3: Cross multiply
    12,692.13x = 18,998.31 × 8,720.16
  4. Step 4: Simplify right side
    12,692.13x = 165,668,302.93
  5. Step 5: Solve for x
    x = 165,668,302.93/12,692.13
  6. Step 6: Final answer
    x = 13,052.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.