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Finding the Fourth Proportional to 12,855.09, 17,741.93 and 8,139.81

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Solution

The fourth proportional to 12,855.09, 17,741.93 and 8,139.81 is: 11,234.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,855.09 : 17,741.93 = 8,139.81 : x
  2. Step 2: Convert to fraction form
    12,855.09/17,741.93 = 8,139.81/x
  3. Step 3: Cross multiply
    12,855.09x = 17,741.93 × 8,139.81
  4. Step 4: Simplify right side
    12,855.09x = 144,415,898.53
  5. Step 5: Solve for x
    x = 144,415,898.53/12,855.09
  6. Step 6: Final answer
    x = 11,234.14

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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.