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Finding the Fourth Proportional to 12,128.65, 18,192.79 and 6,617.09

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Solution

The fourth proportional to 12,128.65, 18,192.79 and 6,617.09 is: 9,925.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,128.65 : 18,192.79 = 6,617.09 : x
  2. Step 2: Convert to fraction form
    12,128.65/18,192.79 = 6,617.09/x
  3. Step 3: Cross multiply
    12,128.65x = 18,192.79 × 6,617.09
  4. Step 4: Simplify right side
    12,128.65x = 120,383,382.53
  5. Step 5: Solve for x
    x = 120,383,382.53/12,128.65
  6. Step 6: Final answer
    x = 9,925.54

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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.