Home / 1,719.21-2,578.82-420.68

Finding the Fourth Proportional to 1,719.21, 2,578.82 and 420.68

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Solution

The fourth proportional to 1,719.21, 2,578.82 and 420.68 is: 631.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,719.21 : 2,578.82 = 420.68 : x
  2. Step 2: Convert to fraction form
    1,719.21/2,578.82 = 420.68/x
  3. Step 3: Cross multiply
    1,719.21x = 2,578.82 × 420.68
  4. Step 4: Simplify right side
    1,719.21x = 1,084,862.34
  5. Step 5: Solve for x
    x = 1,084,862.34/1,719.21
  6. Step 6: Final answer
    x = 631.02

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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.