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Finding the Fourth Proportional to 12,689.65, 19,028.55 and 4,786.07

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Solution

The fourth proportional to 12,689.65, 19,028.55 and 4,786.07 is: 7,176.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,689.65 : 19,028.55 = 4,786.07 : x
  2. Step 2: Convert to fraction form
    12,689.65/19,028.55 = 4,786.07/x
  3. Step 3: Cross multiply
    12,689.65x = 19,028.55 × 4,786.07
  4. Step 4: Simplify right side
    12,689.65x = 91,072,010.90
  5. Step 5: Solve for x
    x = 91,072,010.90/12,689.65
  6. Step 6: Final answer
    x = 7,176.87

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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.