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Finding the Fourth Proportional to 12,855.78, 17,739.81 and 8,139.96

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Solution

The fourth proportional to 12,855.78, 17,739.81 and 8,139.96 is: 11,232.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,855.78 : 17,739.81 = 8,139.96 : x
  2. Step 2: Convert to fraction form
    12,855.78/17,739.81 = 8,139.96/x
  3. Step 3: Cross multiply
    12,855.78x = 17,739.81 × 8,139.96
  4. Step 4: Simplify right side
    12,855.78x = 144,401,343.81
  5. Step 5: Solve for x
    x = 144,401,343.81/12,855.78
  6. Step 6: Final answer
    x = 11,232.41

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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.