Home / 1,719.68-2,579.50-421.15

Finding the Fourth Proportional to 1,719.68, 2,579.50 and 421.15

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Solution

The fourth proportional to 1,719.68, 2,579.50 and 421.15 is: 631.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,719.68 : 2,579.50 = 421.15 : x
  2. Step 2: Convert to fraction form
    1,719.68/2,579.50 = 421.15/x
  3. Step 3: Cross multiply
    1,719.68x = 2,579.50 × 421.15
  4. Step 4: Simplify right side
    1,719.68x = 1,086,352.97
  5. Step 5: Solve for x
    x = 1,086,352.97/1,719.68
  6. Step 6: Final answer
    x = 631.72

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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.