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Finding the Fourth Proportional to 1,144.65, 1,578.43 and 979.41

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Solution

The fourth proportional to 1,144.65, 1,578.43 and 979.41 is: 1,350.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,144.65 : 1,578.43 = 979.41 : x
  2. Step 2: Convert to fraction form
    1,144.65/1,578.43 = 979.41/x
  3. Step 3: Cross multiply
    1,144.65x = 1,578.43 × 979.41
  4. Step 4: Simplify right side
    1,144.65x = 1,545,930.13
  5. Step 5: Solve for x
    x = 1,545,930.13/1,144.65
  6. Step 6: Final answer
    x = 1,350.57

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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.