Home / 12,186.75-16,812.70-8,209.15

Finding the Fourth Proportional to 12,186.75, 16,812.70 and 8,209.15

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Solution

The fourth proportional to 12,186.75, 16,812.70 and 8,209.15 is: 11,325.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,186.75 : 16,812.70 = 8,209.15 : x
  2. Step 2: Convert to fraction form
    12,186.75/16,812.70 = 8,209.15/x
  3. Step 3: Cross multiply
    12,186.75x = 16,812.70 × 8,209.15
  4. Step 4: Simplify right side
    12,186.75x = 138,017,976.21
  5. Step 5: Solve for x
    x = 138,017,976.21/12,186.75
  6. Step 6: Final answer
    x = 11,325.25

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Half scale
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Double scale
Find fourth proportional to 12,187.75, 16,814.08 and 8,210.15
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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.