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Finding the Fourth Proportional to 1,719.29, 2,578.94 and 679.25

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Solution

The fourth proportional to 1,719.29, 2,578.94 and 679.25 is: 1,018.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,719.29 : 2,578.94 = 679.25 : x
  2. Step 2: Convert to fraction form
    1,719.29/2,578.94 = 679.25/x
  3. Step 3: Cross multiply
    1,719.29x = 2,578.94 × 679.25
  4. Step 4: Simplify right side
    1,719.29x = 1,751,728.70
  5. Step 5: Solve for x
    x = 1,751,728.70/1,719.29
  6. Step 6: Final answer
    x = 1,018.87

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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.