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Finding the Fourth Proportional to 12,145, 18,217.18 and 3,379.56

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Solution

The fourth proportional to 12,145, 18,217.18 and 3,379.56 is: 5,069.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,145 : 18,217.18 = 3,379.56 : x
  2. Step 2: Convert to fraction form
    12,145/18,217.18 = 3,379.56/x
  3. Step 3: Cross multiply
    12,145x = 18,217.18 × 3,379.56
  4. Step 4: Simplify right side
    12,145x = 61,566,052.84
  5. Step 5: Solve for x
    x = 61,566,052.84/12,145
  6. Step 6: Final answer
    x = 5,069.25

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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.