Home / 1,719.16-2,578.72-420.64

Finding the Fourth Proportional to 1,719.16, 2,578.72 and 420.64

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Solution

The fourth proportional to 1,719.16, 2,578.72 and 420.64 is: 630.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,719.16 : 2,578.72 = 420.64 : x
  2. Step 2: Convert to fraction form
    1,719.16/2,578.72 = 420.64/x
  3. Step 3: Cross multiply
    1,719.16x = 2,578.72 × 420.64
  4. Step 4: Simplify right side
    1,719.16x = 1,084,712.78
  5. Step 5: Solve for x
    x = 1,084,712.78/1,719.16
  6. Step 6: Final answer
    x = 630.96

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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.