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Finding the Fourth Proportional to 1,719, 2,578.20 and 486.24

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Solution

The fourth proportional to 1,719, 2,578.20 and 486.24 is: 729.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,719 : 2,578.20 = 486.24 : x
  2. Step 2: Convert to fraction form
    1,719/2,578.20 = 486.24/x
  3. Step 3: Cross multiply
    1,719x = 2,578.20 × 486.24
  4. Step 4: Simplify right side
    1,719x = 1,253,623.97
  5. Step 5: Solve for x
    x = 1,253,623.97/1,719
  6. Step 6: Final answer
    x = 729.28

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Double scale
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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.