Home / 1,719.49-2,579.21-420.95

Finding the Fourth Proportional to 1,719.49, 2,579.21 and 420.95

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Solution

The fourth proportional to 1,719.49, 2,579.21 and 420.95 is: 631.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,719.49 : 2,579.21 = 420.95 : x
  2. Step 2: Convert to fraction form
    1,719.49/2,579.21 = 420.95/x
  3. Step 3: Cross multiply
    1,719.49x = 2,579.21 × 420.95
  4. Step 4: Simplify right side
    1,719.49x = 1,085,718.45
  5. Step 5: Solve for x
    x = 1,085,718.45/1,719.49
  6. Step 6: Final answer
    x = 631.42

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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.