Home / 1,719.13-2,578.69-420.60

Finding the Fourth Proportional to 1,719.13, 2,578.69 and 420.60

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Solution

The fourth proportional to 1,719.13, 2,578.69 and 420.60 is: 630.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,719.13 : 2,578.69 = 420.60 : x
  2. Step 2: Convert to fraction form
    1,719.13/2,578.69 = 420.60/x
  3. Step 3: Cross multiply
    1,719.13x = 2,578.69 × 420.60
  4. Step 4: Simplify right side
    1,719.13x = 1,084,597.01
  5. Step 5: Solve for x
    x = 1,084,597.01/1,719.13
  6. Step 6: Final answer
    x = 630.90

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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.