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Finding the Fourth Proportional to 12,405.75, 17,119.94 and 6,816.75

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Solution

The fourth proportional to 12,405.75, 17,119.94 and 6,816.75 is: 9,407.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,405.75 : 17,119.94 = 6,816.75 : x
  2. Step 2: Convert to fraction form
    12,405.75/17,119.94 = 6,816.75/x
  3. Step 3: Cross multiply
    12,405.75x = 17,119.94 × 6,816.75
  4. Step 4: Simplify right side
    12,405.75x = 116,702,351.00
  5. Step 5: Solve for x
    x = 116,702,351.00/12,405.75
  6. Step 6: Final answer
    x = 9,407.12

Related Problems

Find fourth proportional to 6,202.88, 8,559.97 and 3,408.38
Half scale
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Double scale
Find fourth proportional to 12,406.75, 17,121.32 and 6,817.75
Similar ratio
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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.